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Dell Optiplex 755 USFF upgrade to E8400?
Greetings!
I have a Dell Optiplex 755 USFF that I would like to upgrade. According to some techspecs that I found on the Dell site this particular flavor of 755 can support up to an E6850 (65nm). I would like to use the E8400 Wolfdale ( its' 45nm counterpart with the same clock and fsb, but more cache) since I believe it will also run cooler in the small confines of the USFF case. Although not officially supported on the techspec list I found, I see that on both the Dell Financial Services Site and the Dell Auction Site this same configuration is offered in multiple units with the E8400 installed. Can I take this as a confirmation that it would be OK to upgrade to the E8400 in the Opti 755 USFF? Thanks!
PS I already have the E8400 in another mobo so it is not a matter of which to get, only on whether I can use the E8400 in the 755 USFF. If I cannot use the E8400 then I will just keep the current cpu in place, but I'd really like to upgrade using the E8400 if it is possible. The mobo currently has the A11 Bios.
theflash1932
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January 9th, 2012 11:00
The E8400 is supported by the Q35 chipset on the 755, which isn't always enough alone to make it work, but together with the facts that 1) the E8400 was launched about 6 months after the processors on the documented "supported" list, and presumably after that doc was published, and 2) systems are configured out there with that CPU would lead me to say that the E8400 will work in the 755.
www.dell.com/.../opti_755_techspecs.pdf
The latest BIOS version is A21, and while none of them from A12-A21 mention anything about CPU support ... if you have any problems, that would be the first thing to look at, as some undocumented support may have been added.
theflash1932
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January 9th, 2012 11:00
The only harm in trying the swap is damaging some internal part during the swap. There is no harm in trying the processor at BIOS version A11 - the worst that will happen is your system won't POST (black screen, etc.) until you do update it (provided there is even undocumented code addressing processor compatibility), or change it back. Of course, under warranty, there's no harm in updating the BIOS either, in the extremely unlikely event that the BIOS flash goes bad.
avibber56
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January 21st, 2013 10:00
Yes, the BIOS will work on all of the flavors of 755 Desktop, Mini Tower, USFF, SFF, etc... I think when you were searching by your Service Tag, it was only giving the "Recommended" updates for your system, not updates that may have been Optional, such as the BIOS's greater than A19
speedstep
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January 21st, 2013 10:00
The drivers area has been hozed for quite some time.
A22 is the latest bios been out a few weeks.
There is no such thing as USFF version of the bios. The bios is for all models.
http://downloads-us.dell.com/FOLDER01133147M/1/O755-A22.exe
1/3/2013 9:40 PM 2247144 O755-A22.exe
speedstep
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January 9th, 2012 11:00
The 755 uses the intel® Q35 express Chipset
Q6xxx series)
Intel® Q35 Express Chipset with 82801IDO I/O Controller Hub (ICH9DO)
Spec says so at Intel so With the correct Bios I would say Yes no problem.
Processor Type - Intel® Core™ 2 Quad - 1066MHz FSB, LGA 775, 8MB L2 cache,
Intel® VT, Enhanced Intel SpeedStep® Technology, Intel® 64 and Execute Disable Bit (Q6xxx series)
Intel® Core™ 2 Duo - 1333MHz FSB, LGA 775, 4MB L2 cache, Intel® vPro™ Technology, Intel® VT, Intel® TXT, Enhanced Intel SpeedStep® Technology, Intel® 64 and Execute Disable Bit (E6x50 series)
Intel® Core™ 2 Duo - 800MHz FSB, LGA 775, 2MB L2 cache, Enhanced Intel SpeedStep® Technology, Intel® 64 and Execute Disable Bit (E4000 series)
Intel® Pentium®- 800MHz FSB, LGA 775, 1MB L2 cache, Enhanced Intel SpeedStep® Technology, Intel® 64 and Execute Disable Bit (E2000 series)
Intel® Celeron®- 800MHz FSB, LGA 775, 512MB L2 cache, Intel® 64 and Execute Disable Bit Chipset Intel® Q35 Express Chipset (ICH9DO)
Intel® Q35 Express Chipset with 82801IDO I/O Controller Hub (ICH9DO)
Compatible Processors
Expand All
View the Intel® Core™2 Quad Processor Q9550S (12M Cache, 2.83 GHz, 1333 MHz FSB)
View the Intel® Core™2 Quad Processor Q9650 (12M Cache, 3.00 GHz, 1333 MHz FSB)
View the Intel® Core™2 Duo Processor E8600 (6M Cache, 3.33 GHz, 1333 MHz FSB)
View the Intel® Core™2 Quad Processor Q9550 (12M Cache, 2.83 GHz, 1333 MHz FSB)
View the Intel® Core™2 Duo Processor E6600 (4M Cache, 2.40 GHz, 1066 MHz FSB)
View the Intel® Core™2 Quad Processor Q8200S (4M Cache, 2.33 GHz, 1333 MHz FSB)
View the Intel® Core™2 Quad Processor Q8400S (4M Cache, 2.66 GHz, 1333 MHz FSB)
View the Intel® Core™2 Duo Processor E6750 (4M Cache, 2.66 GHz, 1333 MHz FSB)
View the Intel® Core™2 Duo Processor E6850 (4M Cache, 3.00 GHz, 1333 MHz FSB)
View the Intel® Core™2 Duo Processor E8500 (6M Cache, 3.16 GHz, 1333 MHz FSB)
View the Intel® Core™2 Quad Processor Q9300 (6M Cache, 2.50 GHz, 1333 MHz FSB)
View the Intel® Core™2 Quad Processor Q9400 (6M Cache, 2.66 GHz, 1333 MHz FSB)
View the Intel® Core™2 Duo Processor E8400 (6M Cache, 3.00 GHz, 1333 MHz FSB)
View the Intel® Core™2 Quad Processor Q8200 (4M Cache, 2.33 GHz, 1333 MHz FS
View the Intel® Core™2 Quad Processor Q8300 (4M Cache, 2.50 GHz, 1333 MHz FSB)
View the Intel® Core™2 Duo Processor E6400 (2M Cache, 2.13 GHz, 1066 MHz FSB)
View the Intel® Core™2 Duo Processor E7600 (3M Cache, 3.06 GHz, 1066 MHz FSB)
View the Intel® Core™2 Duo Processor E4600 (2M Cache, 2.40 GHz, 800 MHz FSB)
View the Intel® Core™2 Duo Processor E7500 (3M Cache, 2.93 GHz, 1066 MHz FSB)
View the Intel® Core™2 Duo Processor E7400 (3M Cache, 2.80 GHz, 1066 MHz FSB)
View the Intel® Core™2 Duo Processor E4300 (2M Cache, 1.80 GHz, 800 MHz FSB)
View the Intel® Pentium® Processor E6800 (2M Cache, 3.33 GHz, 1066 FSB)
View the Intel® Pentium® Processor E6600 (2M Cache, 3.06 GHz, 1066 FSB)
View the Intel® Pentium® Processor E6700 (2M Cache, 3.20 GHz, 1066 FSB)
View the Intel® Pentium® Processor E6300 (2M Cache, 2.80 GHz, 1066 MHz FSB)
View the Intel® Pentium® Processor E6500 (2M Cache, 2.93 GHz, 1066 FSB)
View the Intel® Pentium® Processor E2140 (1M Cache, 1.60 GHz, 800 MHz FSB)
View the Intel® Pentium® Processor E2180 (1M Cache, 2.00 GHz, 800 MHz FSB)
View the Intel® Pentium® Processor E2200 (1M Cache, 2.20 GHz, 800 MHz FSB)
View the Intel® Pentium® Processor E2220 (1M Cache, 2.40 GHz, 800 MHz FSB)
View the Intel® Pentium® Processor E5200 (2M Cache, 2.50 GHz, 800 MHz FSB)
View the Intel® Pentium® Processor E5400 (2M Cache, 2.70 GHz, 800 MHz FSB)
View the Intel® Pentium® Processor E5500 (2M Cache, 2.80 GHz, 800 MHz FSB)
View the Intel® Pentium® Processor E5700 (2M Cache, 3.00 GHz, 800 MHz FSB)
View the Intel® Pentium® Processor E5800 (2M Cache, 3.20 GHz, 800 MHz FSB)
View the Intel® Pentium® Processor E5300 (2M Cache, 2.60 GHz, 800 MHz FSB)
View the Intel® Pentium® Processor E2160 (1M Cache, 1.80 GHz, 800 MHz FSB)
View the Intel® Celeron® Processor 450 (512K Cache, 2.20 GHz, 800 MHz FSB)
View the Intel® Celeron® Processor E1600 (512K Cache, 2.40 GHz, 800 MHz FSB
View the Intel® Celeron® Processor E3500 (1M Cache, 2.70 GHz, 800 MHz FSB)
View the Intel® Celeron® Processor E1200 (512K Cache, 1.60 GHz, 800 MHz FSB)
Intel® Q35 Express Chipset with 82801IDO I/O Controller Hub (ICH9DO)
View the Intel® Celeron® Processor E1400 (512K Cache, 2.00 GHz, 800 MHz FSB)
View the Intel® Celeron® Processor E3200 (1M Cache, 2.40 GHz, 800 MHz FSB)
View the Intel® Celeron® Processor E3300 (1M Cache, 2.50 GHz, 800 MHz FSB)
Intel® Q35 Express Chipset with 82801IDO I/O Controller Hub (ICH9DO)
View the Intel® Celeron® Processor E3400 (1M Cache, 2.60 GHz, 800 MHz FSB)
Intel® Q35 Express Chipset with 82801IDO I/O Controller Hub (ICH9DO)
View the Intel® Celeron® Processor 440 (512K Cache, 2.00 GHz, 800 MHz FSB)
View the Intel® Celeron® Processor E1500 (512K Cache, 2.20 GHz, 800 MHz FSB)
View the Intel® Celeron® Processor 430 (512K Cache, 1.80 GHz, 800 MHz FSB)
View the Intel® Celeron® Processor 420 (512K Cache, 1.60 GHz, 800 MHz FSB)
View the Intel® Core™2 Duo Processor E4400 (2M Cache, 2.00 GHz, 800 MHz FSB)
View the Intel® Core™2 Duo Processor E4500 (2M Cache, 2.20 GHz, 800 MHz FSB)
View the Intel® Core™2 Duo Processor E4700 (2M Cache, 2.60 GHz, 800 MHz FSB)
View the Intel® Core™2 Duo Processor E6300 (2M Cache, 1.86 GHz, 1066 MHz FSB)
View the Intel® Core™2 Duo Processor E6320 (4M Cache, 1.86 GHz, 1066 MHz FSB)
View the Intel® Core™2 Duo Processor E6420 (4M Cache, 2.13 GHz, 1066 MHz FSB)
Intel® Q35 Express Chipset with 82801IDO I/O Controller Hub (ICH9DO)
View the Intel® Core™2 Duo Processor E6540 (4M Cache, 2.33 GHz, 1333 MHz FSB)
View the Intel® Core™2 Duo Processor E6550 (4M Cache, 2.33 GHz, 1333 MHz FSB)
Intel® Q35 Express Chipset with 82801IDO I/O Controller Hub (ICH9DO)
View the Intel® Core™2 Duo Processor E6700 (4M Cache, 2.66 GHz, 1066 MHz FSB)
View the Intel® Core™2 Duo Processor E7200 (3M Cache, 2.53 GHz, 1066 MHz FSB)
View the Intel® Core™2 Duo Processor E7300 (3M Cache, 2.66 GHz, 1066 MHz FSB)
View the Intel® Core™2 Duo Processor E8190 (6M Cache, 2.66 GHz, 1333 MHz FSB)
View the Intel® Core™2 Duo Processor E8200 (6M Cache, 2.66 GHz, 1333 MHz FSB)
View the Intel® Core™2 Duo Processor E8300 (6M Cache, 2.83 GHz, 1333 MHz FSB)
View the Intel® Core™2 Quad Processor Q9400S (6M Cache, 2.66 GHz, 1333 MHz FSB)
View the Intel® Pentium® Processor E6500K (2M Cache, 2.93 GHz, 1066 MHz FSB)
View the Intel® Core™2 Quad Processor Q9450 (12M Cache, 2.66 GHz, 1333 MHz FSB)
View the Intel® Core™2 Quad Processor Q6600 (8M Cache, 2.40 GHz, 1066 MHz FSB)
rick3
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January 9th, 2012 15:00
Many many thanks 'flash for the quick responses today and your help. FYI the unit is currently running a Xeon3070 with no issues and it isn't on the official Dell compatibility list either--but since it is a twin to the E6700 I didn't have as much hesitation with that swap as I did jumping from 65nm Conroe down to 45nm Wolfdale.
Also thanks Speedstep for the elaboration on the Q35 chipset, I knew it would support the cpu but as is known sometimes OEM vendors modify their bioses so I asked to see if anyone knew firsthand if Dell had "dampened" the compatibility for system stability reasons in the USFF version.
avibber56
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January 20th, 2013 19:00
Just to be clear, the power supply for the USFF is 220 W according to the tech specs chart, not 150W.
I am running the latest BIOS which is A22, so that should not be a problem at all.
Also, the E8400 is essentially the same thing as the E6850, just with the 45 nm process instead of the 65 nm. So the power consumption should be the same, and the power should not be an issue. The real issue in question is whether or not Dell has added support for the 45 nm Core 2 Duos in their BIOS, because they are supported natively on the chipset by Intel.
avibber56
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January 20th, 2013 19:00
I am just wondering if you ever tried this processor and if so, what were your findings on your USFF machine?
speedstep
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January 20th, 2013 19:00
The power supply for the USFF is 150W not 270W so for many processors I would say the answer is not clear.
NOT UPDATING BIOS TO A21 could be a real issue.
130W processors Are not going to work in a USFF with 150W power supply,
E8400
E6850 is ok.
Intel® Core™2 Duo Processor E6850
(4M Cache, 3.00 GHz, 1333 MHz FSB)
The QX8200 May not work due to
CPUID 010677h
Core stepping M1
I also think the 130W and 150W cpu's would require a Tower with Greater than
305W power supply AND the Copper heatpipe heatsink.
These are the Quads we validated -
N652J 3.00GHz YorkfieldQuad Core Q9650, 12MB Q9650
Enhanced SpeedStep technology
Execute disable bit
Extended Halt state
Extended Stop Grant state
Thermal Monitor 2
Trusted Execution technology
Virtualization technology
F886J 2.83GHz Yorkfield Quad Core Q9550 12MB, 1333FSB, E0
N650J 2.66GHz Yorkfield Quad Core Q9400, 6MB, 1333FSB, R0
MP627 2.66GHz Kentsfield Quad Core Q6700, 8MB, 1066FSB, G0
Dell recommends applying this update during your next scheduled update cycle. The update contains feature enhancements or changes that will help keep your system software current and compatible with other system modules (firmware, BIOS, drivers and software).
UPDATING the bios must be done BEFORE trying another cpu.
O755-A21.exe
SLB5M
SLG9S
1067A (SLG9S)
V core 0.85V - 1.3625V
CPUs, related to Intel Core 2 Quad Q8200
Threads
cache
CPUs, related to Intel Core 2 Extreme QX9650
Threads
cache
processing
speedstep
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January 20th, 2013 23:00
"Just to be clear, the power supply for the USFF is 220 W according to the tech specs chart, not 150W"
The external Brick is not the same as the power rating for the INTERNAL MOTHERBOARD VRM's
This is also why the Quads are Not listed as compatable with the USFF.
This is not to say that it wont work. I dont know fer shuure cuz I aint got one.
HOWEVER this is also not a Guarantee that it DOES work.
Without Updating the Bios to A21 it is highly LIKELY that it will not post OR it will simply state unsupported processor and either HALT or make you Press F1 to continue Each and every time.
rick3
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January 21st, 2013 10:00
??? I didn't make this up. When I go to support and look for downloads, it filters results based on my service tag. That gives me filtered results based on my particular service tag (USFF) and this is copypasta from that resultant page.
"Dell OptiPlex 755 System BIOS
OptiPlex 755 System BIOS
Release Date: 6/30/2011
Importance: Recommended
Version: A19 See Previous Versions
The following formats are available for the file you have selected
File Format: Windows/DOS Get Driver Download File
Add To My Download List Add to My Download List
File Name:
O755-A19.exe
Description: This file format consists of a BIOS executable file. The Universal (Windows/MS DOS) format can be used to install from Windows XP, Windows 2000, NT, Windows 9X, Windows ME or a MS DOS environment.
Download Type: HTTP
File Size: 2MB"
Now, if it is true and supported that any 755 bios will work on any flavor 755 from desktop >>> USSF, I will go ahead and reflash to the latest supported compatible bios. Who knows, that may fix my USB issues as well... let me know!
speedstep
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January 21st, 2013 10:00
Not sure why you made up that.
There is only 1 BIOS for ALL Models not a separate Bios for USFF.
BIOS - BIOS
OptiPlex 755 System BIOS
A22 is Very New
rick3
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January 21st, 2013 10:00
avibber56, I didn't end up installing it and ended up having a mobo replacement due to the YROD, luckily it happened before my warranty ran out. I was too apprehensive to attempt to install the E8400 just in case it would damage the replacement. mobo, but it has been running with the Xeon ever since, abeit with USB issues. I have seen many Optiplex 755 USSF units for sale on ebay with the E8400 installed though so I'm thinking that they will work, I just lost the initiative to install it. I also have a Q9450 but even if the mobo will support it I don't think the limited stock cooling will keep it stable, it would probably overheat in those small quarters with that stock hs/f.
You are posting about a USSF but the Dell site only shows a bios for the USFF up to A19, so if you are using the A21 or A22, are you using SFF bios instead of the USSF?
avibber56
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January 21st, 2013 10:00
Also, would there be a model difference in which I should choose between the models of:
SLAPL (C0)
SLB9J (E0)
avibber56
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January 21st, 2013 10:00
I think I am just going to bite the bullet and order the E8400. If it doesn't work, I can just simply send it back and then get the E6850. And I am indeed using the A22 on the USFF, its the newest.