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Optiplex 755 CPU Upgrade
I've been researching this for over a week & my brain is mush.
My current 755 setup is
Intel Core 2 Duo E6400
2GB Memory
Radeon HD 4650
160GB - Windows XP SP3/All current drivers & updates
1TB SATA
2TB SATA
BIOS - A22
I've been looking to see the fastest processor this motherboard ( OGM819 w/Q35 chipset). I've found a ton of info but no definitve answer. I believe that an E8400 is the fastest & in my price ranges. So 1A. Is this the fastest CPU I can upgrade too? 1B. Will the stock heatsink & power supply do or will they need upgrading also? If so what power supply will I need? To add to this I found a thread somewhere that stated I could upgrade to a 64 bit CPU, is this correct & what would you recommend?
2. Memory - the software I downloaded from Dell - 'My Dell' states that I can upgrade to 8GB but looking further my current setup, 32 bit will only see 4 GB, correct? So the only way to upgrade to 8GB is via a 64 bit CPU, correct again?
Why am I doing this. I'm ripping my blue-ray collection to this pc which is now my HTPC. 3TB looks huge but not when you rip uncompressed iso. What I'm running into is that I'm compressing some of this isos to BD25 to save space but the process is taking up to 11 hours with the current setup. Any & all suggestion are extremely welcomed. While my 755 just sits there I want to speed up the process as much as I can.
Thank you all in advance.
Thom
shesagordie
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August 1st, 2013 12:00
injera
http://en.community.dell.com/support-forums/desktop/f/3514/p/19276940/19960807.aspx#19960807
With a 64-bit operating system, 8gb [4 x 2gb modules] is supported.
Bev.
speedstep
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August 2nd, 2013 12:00
After updating to the latest bios I would say up to 45nm Q9650 for the Mini Tower.
You would have to make sure that you get PC6400 DDR2 Ram if you do that.
UPDATE THE BIOS BEFORE trying to install a newer processor.
The Q9650 worked in my minitower bios A20.
DELL-Saharsh K
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August 5th, 2013 16:00
Hi Thom,
You may install E8400 and the currently installed heatsink and power supply should suffice. However, Dell has not tested this processor on this system.
Hope this helps. Please reply if you have any questions.
speedstep
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December 30th, 2015 08:00
The ASUS GT740-2GD3-CSM 2GB is a 75W card so it does not need an AUX power connection and works fine with 305W Tower power supply.
DELL-Saharsh K
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August 1st, 2013 12:00
Hi Thom,
The OptiPlex 755 supports the Intel Core 2 Quad, Intel Core2 Duo, Intel Pentium dual-core, Intel Celeron processors based on Intel's 775-pin (LGA775) socket. You may check the list of Dell tested processors from the link shared by shesagordie.
Theoretically speaking, you should be able to install Intel Core 2 Duo Processor E8400 (6M Cache, 3.00 GHz, 1333 MHz FSB) on this system and it should function properly. However, Dell has not tested this processor on this system. For your reference you may also want to check the comparison between the one installed and Intel Core 2 Duo Processor E8400. Here is the link http://dell.to/18UuBpT.
Note: Dell does not recommend or offer processor upgrade but it is as your discretion in case you really wish to go ahead with it. Warranty per say, issues arising due to the upgrade will not be covered under warranty , however we will continue providing support for other issues and parts.
Please refer to the User's Guide for instructions on replacing the hardware components. Please follow the safety guide lines.
Please reply if you have any questions. I'll be happy to assist further.
injera
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August 2nd, 2013 19:00
Sahash,
Thank you for the info. Things are getting clearing on doing this upgrade.
I have an additional question. Between a E8400 & an E6850 which would you recommend. The spec & price are almost the same except the E8400 has a bigger cache. Also will I need to upgrade my heatsink & power supply also? What would you recommend?
Thanks in advance.
Thom
injera
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August 2nd, 2013 19:00
Bev,
Thanks for verifing. If dell was just as clear. I was getting confused by the manuals and what their software was saying.
Thom
speedstep
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August 6th, 2013 07:00
Intel® Core™2 Duo Processor E8400 (6M Cache, 3.00 GHz, 1333 MHz FSB) might require PC2 8500 Ram.:emotion-3: Looks like the fastest ram supported by the memory hub is PC2 6400.
diggy76
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August 17th, 2014 14:00
Greeitings:
DID YOU UPGRADE YOUR POWER SUPPLY ?
When you updated your processor to the Q9650, did you have to upgrade your current power supply with one that is stronger ?
I want to replace my Duo Core processor with the Q6600 and noticed my 755 has an aluminum heat sink, and have purchased a copper one.
My power supply is a DELL - 305 watts. Question: can this power supply handle running the Q6600 quad CPU plus the copper heat sink? Also, will I have to replace or change the RAM ?
I would "greatly" appreciate any advice anyone could pass along.
Tom
speedstep
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August 20th, 2014 12:00
With the Mini tower its fine. Q6600 or Q6700
Dell validated 8GB of DDR2-667 (PC2-5300) and DDR2-800 (PC6400) non-ECC memory. DDR2-1066Mhz PC2-8500 is overkill because the memory Hub will run at 800Mhz max.
http://www.dell.com/downloads/global/products/optix/en/opti_755_techspecs.pdf
NgtFlyer
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November 30th, 2015 05:00
I am glad to have found this thread and your message. I have an Optiplex 755 and it's good to know that the Q9650 is an upgrade option. My current processor is the Q6600 so I already have the larger heatsink. with copper heat pipes. My machine already has PC2-6400 memory installed. I suspect the Q6600 will be just fine though.
I plan to replace the original ATI video card with an R7-250 (single slot version from Sapphire).
My machine has the 305W PSU.
Would make a nice guest machine that is capable of most anything they would want to do including some gaming. These older Optiplex core-2 machines are true workhorses that last and last.
speedstep
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December 3rd, 2015 06:00
Sapphire R series cards have an issue where they wont F2 into CMOS because they dont support DOS VESA Video mode 103. The only fix for this is to not use sapphire cards.
I ended up replacing it with a GT740 from Asus.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121877
ian Hu
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December 30th, 2015 07:00
Hi guys, I just found out this thread as well.
I'm also planning to upgrade my current Optiplex 755 Desktop with Q9650
I have several questions, I hope someone can answer these:
1. Will the current PSU suffice ? (Q9650 = TDP 95 ; my stock PSU is only 280W)
2. Will the stock heatsink could disperse the heat? any recommendation to change with another sink&fan?
NgtFlyer
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December 30th, 2015 08:00
That is a really valuable piece of information! I have not yet purchased a video card for that machine as it continues to serve as a bench computer but the upgrade is coming. Thank you for posting that update and thank you for the link to the card that worked for you! I am unable to tell from the pictures - does this card have an external 12V header? My 755 does not have a spare 6 or 8 pin 12v connector from the PSU.
Thanks again for this update. Super valuable information!
ian Hu
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December 30th, 2015 09:00
I bought this card a while ago, the thing is, this card is a dual-slot card, so I have to remove the metal backplate, so it'll fit my Dell.
Working flawlessly. Priced at 80$ ; with 20$ rebate become around 60$
Unfortunately, it's out of stock
http://www.tigerdirect.com/applications/searchtools/item-details.asp?EdpNo=9099811
PS : I still need answer for my previous questions :'|