Optiplex 740 Processor Upgrade

Well, fair enough, you helped a lot already. It is a pity that you can not provide full model numbers onthe list you pictured earlier, probably you don't know them as well.

Oh well, we will figure them out if OP want to continue.

I am not Dell engineering and I don't publish Lists.

Dell model HK912 for 89 watt CPUs. All thanks are going to Dell-Vikram for verification of possible heatsinks for this Optiplex.

http://www.impactcomputers.com/hk912.html $44.95

http://www.thebestpartinc.com/hk912.html $23.00

http://www.ebay.com/itm/Dell-Dimension-C521-Optiplex-740-Heatsink-UT061-HK912-/200504050412 $19.99

So, cprhodin, I hope you are reading all this, waiting for your response now.

Edit. I just realized that you already have this copper heatsink, so just forget about this post, there is nothing better that this cooler available. So, at this time I need your CPUID results.

Wow, step away from my computer for a few days...

I have the 3800+ back in the 740 and I put the 6000+ into a system with an ABIT KN9 Ultra motherboard.  It runs fast and cool there.  It's been on several days without a glitch.  I don't suppose CPUID runs on Linux?  In any case the 740 is running W7 so here's the  processor section from the CPU-Z generated text file.

Processors Information
-------------------------------------------------------------------------

Processor 1 ID = 0
 Number of cores 2 (max 2)
 Number of threads 2 (max 2)
 Name AMD Athlon 64 X2 3800+
 Codename Windsor
 Specification AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
 Package Socket AM2 (940)
 CPUID F.B.2
 Extended CPUID F.4B
 Brand ID 4
 Core Stepping BH-F2
 Technology 90 nm
 Core Speed 1002.1 MHz
 Multiplier x FSB 5.0 x 200.4 MHz
 HT Link speed 1002.1 MHz
 Stock frequency 2000 MHz
 Instructions sets MMX (+), 3DNow! (+), SSE, SSE2, SSE3, x86-64, AMD-V
 L1 Data cache 2 x 64 KBytes, 2-way set associative, 64-byte line size
 L1 Instruction cache 2 x 64 KBytes, 2-way set associative, 64-byte line size
 L2 cache 2 x 512 KBytes, 16-way set associative, 64-byte line size
 FID/VID Control yes
 Max FID 10.0x
 Max VID 1.300 V
 # of P-States 3
 P-State FID 0x2 - VID 0x12 (5.00x - 1.100 V)
 P-State FID 0xA - VID 0x0E (9.00x - 1.200 V)
 P-State FID 0xC - VID 0x0C (10.00x - 1.250 V)


 K8 Thermal sensor yes
 K8 Revision ID 5.2
 Attached device PCI device at bus 0, device 24, function 0
 Attached device PCI device at bus 0, device 24, function 1
 Attached device PCI device at bus 0, device 24, function 2
 Attached device PCI device at bus 0, device 24, function 3


Thread dumps
-------------------------------------------------------------------------

CPU Thread 0 
 APIC ID 0
 Topology Processor ID 0, Core ID 0, Thread ID 0
 Type 02002008h
 Max CPUID level 00000001h
 Max CPUID ext. level 80000018h
 Cache descriptor Level 1, I, 64 KB, 1 thread(s)
 Cache descriptor Level 1, D, 64 KB, 1 thread(s)
 Cache descriptor Level 2, U, 512 KB, 1 thread(s)

 CPUID 
 0x00000000 0x00000001 0x68747541 0x444D4163 0x69746E65
 0x00000001 0x00040FB2 0x00020800 0x00002001 0x178BFBFF
 0x80000000 0x80000018 0x68747541 0x444D4163 0x69746E65
 0x80000001 0x00040FB2 0x000008CD 0x0000001F 0xEBD3FBFF
 0x80000002 0x20444D41 0x6C687441 0x74286E6F 0x3620296D
 0x80000003 0x32582034 0x61754420 0x6F43206C 0x50206572
 0x80000004 0x65636F72 0x726F7373 0x30383320 0x00002B30
 0x80000005 0xFF08FF08 0xFF20FF20 0x40020140 0x40020140
 0x80000006 0x00000000 0x42004200 0x02008140 0x00000000
 0x80000007 0x00000000 0x00000000 0x00000000 0x0000003F
 0x80000008 0x00003028 0x00000000 0x00000001 0x00000000
 0x80000009 0x00000000 0x00000000 0x00000000 0x00000000
 0x8000000A 0x00000001 0x00000040 0x00000000 0x00000000
 0x8000000B 0x00000000 0x00000000 0x00000000 0x00000000
 0x8000000C 0x00000000 0x00000000 0x00000000 0x00000000
 0x8000000D 0x00000000 0x00000000 0x00000000 0x00000000
 0x8000000E 0x00000000 0x00000000 0x00000000 0x00000000
 0x8000000F 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000010 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000011 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000012 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000013 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000014 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000015 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000016 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000017 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000018 0x00000000 0x00000000 0x00000000 0x00000000

 MSR 0x0000001B 0x00000000 0xFEE00900
 MSR 0xC0010114 0x00000000 0x00000000
 MSR 0xC001001E 0x00000000 0x00000052
 MSR 0xC0010015 0x00000000 0x02000040
 MSR 0xC0010042 0x310A120C 0x0A0C020C
 MSR 0xC0010041 0x00000001 0x00000C0C

CPU Thread 1 
 APIC ID 1
 Topology Processor ID 0, Core ID 1, Thread ID 0
 Type 02002008h
 Max CPUID level 00000001h
 Max CPUID ext. level 80000018h
 Cache descriptor Level 1, I, 64 KB, 1 thread(s)
 Cache descriptor Level 1, D, 64 KB, 1 thread(s)
 Cache descriptor Level 2, U, 512 KB, 1 thread(s)

 CPUID 
 0x00000000 0x00000001 0x68747541 0x444D4163 0x69746E65
 0x00000001 0x00040FB2 0x01020800 0x00002001 0x178BFBFF
 0x80000000 0x80000018 0x68747541 0x444D4163 0x69746E65
 0x80000001 0x00040FB2 0x000008CD 0x0000001F 0xEBD3FBFF
 0x80000002 0x20444D41 0x6C687441 0x74286E6F 0x3620296D
 0x80000003 0x32582034 0x61754420 0x6F43206C 0x50206572
 0x80000004 0x65636F72 0x726F7373 0x30383320 0x00002B30
 0x80000005 0xFF08FF08 0xFF20FF20 0x40020140 0x40020140
 0x80000006 0x00000000 0x42004200 0x02008140 0x00000000
 0x80000007 0x00000000 0x00000000 0x00000000 0x0000003F
 0x80000008 0x00003028 0x00000000 0x00000001 0x00000000
 0x80000009 0x00000000 0x00000000 0x00000000 0x00000000
 0x8000000A 0x00000001 0x00000040 0x00000000 0x00000000
 0x8000000B 0x00000000 0x00000000 0x00000000 0x00000000
 0x8000000C 0x00000000 0x00000000 0x00000000 0x00000000
 0x8000000D 0x00000000 0x00000000 0x00000000 0x00000000
 0x8000000E 0x00000000 0x00000000 0x00000000 0x00000000
 0x8000000F 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000010 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000011 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000012 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000013 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000014 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000015 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000016 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000017 0x00000000 0x00000000 0x00000000 0x00000000
 0x80000018 0x00000000 0x00000000 0x00000000 0x00000000

 MSR 0x0000001B 0x00000000 0xFEE00800
 MSR 0xC0010114 0x00000000 0x00000000
 MSR 0xC001001E 0x00000000 0x00000052
 MSR 0xC0010015 0x00000000 0x02000040
 MSR 0xC0010042 0x310A1212 0x0A0C0202
 MSR 0xC0010041 0x00000001 0x00001202

OK, there is only one possibility left, and it could be applicable to only Dell MOBO - Brisbane 65 nm is not working on the socket for Windsor 90 nm. I am not sure how to formulate this properly, let me try again - Dell BIOS "don't" like more advanced 65 nm CPU, something preventing 65 nm CPU to work on MOBO originally designed for 90 nm CPU.

The list SpeedStep provided earlier contained both 65 nm and 90 nm CPUs, however I noticed at times that even Dell Liasons provided in the past incorrect list of processors for AMD line of Dell models. So disregard SpeedStep's list as questionable.

So, can you use this 6000+ CPU elsewhere? Or you lost money? There is a chance that 90 nm 6000+ would work, it was a big wave of users using 6000+ upgrades in the past without changing PSU. I was advising them to use 90 nm version due to larger cache of 1 GB vs 512 MB for faster one 65 nm. No one complained about overheating afterwards, so maybe this is the answer?

Other than this explanation, unless you are ready to accept previous theory about MOBO which is about to fry, I don't think there are other explanations.

So would you consider 90 nm 6000+?

Just want to add: Once I had also Athlon 64 X2 6000+ and it heated like hell, not usable with basic coolers. Similar problems experienced only with Pentium 4 Prescott processors. 

Since optiplex 740 works also with Phenom, why don't you take a Phenom x3 or X4, less heating problems, more performance.  

Why wouldn't an Athlon II x4 630 AM3 work? These are also 95W, probably more efficient than the Phenoms, and are true quad core CPU's, among the first of AMD's consumer quad CPU lineup. The X4 620 was the lowest of the lot at $99 new, and the 630 has a WEI score of 7.2, though on a MB that's AM2 & with DDR2 RAM, there will be lost performance. 

The only issue that I can see, would be the CPU fan connector, if standard, Newegg carries a splitter to power both the CPU & inbuilt exhaust fan. Being that the 620-630 x4 series requires a downward blowing fan, some type of way to run both the passive cooling fan & that of the CPU will be needed. 

Other than the loss of power, though the GHz level would be the same, the AM2 MB cannot use some features of the newer CPU line, still it's 95W, has it's own cooler & don't see why it won't work. 

Being that I have an Optiplex 740 of my own in storage, as well as boxed Athlon II x4 630 complete with cooler, will have to give this a shot & report findings back, with CUPID snapshot, or link to the profile. 

We need to know the true capabilities of this PC, whether or not Dell sanctioned. 

At one time, neither was the i7-4790K an 'approved' CPU for the XPS 8700, nor the GTX 970, on the stock PSU, now with the A15 BIOS update, both upgrades are possible. Though today, maybe it's best to wait out the GeForce 1070, performs much better, using less juice to run. I suppose that'll prompt another BIOS update (or UEFI upgrade), whatever it's proper term is. 

Cat

Try adding an out take fan in the back, I found this helps the thermal conditions and keeps the system stable.