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Optiplex 740 Processor Upgrade
I just installed a recycled Athlon 64 X2 6000+ processor into my 740. It's the 89W version, not the 125W. The processor I'm replacing is a 65W 3800+. The BIOS recognizes and identifies the new processor correctly. The system boots (faster) and runs stably for the first few minutes but then the temperature starts to spike. Up until that time the temperature is constant and moderately hotter than the 3800+ (seems reasonable, 89W vs. 65W). I've swapped between the two processors several times, recleaning and reapplying thermal compound each time, without changing the outcome (other than a slight reduction in the old processors temperature).
I have the latest BIOS. The fans are all turning and moving air. The automatic fan speed control is behaving correctly.
At this point I have three questions:
1) Does the fact that the BIOS recognizes the 6000+ and the system boots cleanly mean that the 6000+ is actually compatible with my motherboard?
2) Do processors fail in this way, run fine but then go into some sort of thermal runaway?
3) Can the same heatsink that's been untouched for 4+ years and full of dust work for a 65W processor and then fail with an 89W processor after a thorough cleaning?
Chris
kisianik
893 Posts
0
March 4th, 2013 12:00
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.
speedstep
9 Legend
9 Legend
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47K Posts
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March 4th, 2013 12:00
I am not Dell engineering and I don't publish Lists.
kisianik
893 Posts
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March 4th, 2013 13:00
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.
cprhodin
5 Posts
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March 7th, 2013 23:00
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.
kisianik
893 Posts
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March 8th, 2013 07:00
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+?
lucafaia
4 Posts
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October 26th, 2014 05:00
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.
catilley1092
172 Posts
0
May 23rd, 2016 13:00
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
Seanprawn
3 Posts
0
February 14th, 2017 10:00
Try adding an out take fan in the back, I found this helps the thermal conditions and keeps the system stable.