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Old November 26, 2010, 05:21 AM
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Hey guys,

I have a few decisions to make with respect to my folding farm. The backstory is, I have three PCs in my garage - acting as space heaters.. it's great for the winter, not so much in the summer.

I have three boxes, One i7 860 (which will remain), Two i7 920s.. one Gigabyte UD3R @4.0Ghz and one ASUS P6T @3.8Ghz.

What i'm looking to do is acquire two Xeon L5639 CPUs.. and wondering what the best course of action is.
First issue, is that both 920 motherboards don't support the L5639s.. but most motherboards say they do not support the L5639. Does anyone know if these do, or would I have to sell them off and get something like an ASUS Sabertooth (which I read here can run the CPUs)

Second, rather than flat upgrading the CPUs, would it be better (PPD wise) to just sell off the mobos/920 cpus/cases and grab an SR-2 for the two L5639's? The power supply, I already have a dual EPS.. and the ram is exactly the same in the 920s, so that would fit fine (Gskill triple channel 1600 3x2gig (x2 kits)). I'd probably order a new case, which adds about $300 to the mix.

Third, the SR-2 seems to have a soft limit of 200Mhz bus.. does anyone with a single board beat this number easiliy? IE: would it be better from an overclock standpoint to go with two single boards to have higher overclocks with these chips, resulting in higher PPD?

Does anyone have PPD numbers on a single L5639 in a mobo, vs an SR-2 with two L5639's?

I would expect, power wise.. that a single SR-2 would use less power than two boxes.

From reading around, i'd be clocking the L5639 at 3.6Ghz (ish) no matter which motherboard they are in.

Comments welcome, hoping to raise my PPD through this transition as efficiently as possible.

Cheers.
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Old November 26, 2010, 05:43 AM
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Check this thread out, it has all your answers vs. the SR2: SR-2 Optimization Thread - [H]ard|Forum

I'm surprised that some X58 boards can't run the Hexa cores; not even after a BIOS flash to the latest?

ppd/w is the best with the SR2; expect over 100k ppd average and ~550w power consumption under load.
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Old November 26, 2010, 06:10 AM
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I will answer for compatility , I ran the 5639 on the sabertooth, no problem. And Xeven ran it on another asus board. He got to 4.0 and I stopped at 3.8. The 5639 does not really exist on Intel specification (!) so it is normal that Mobo manufacturer dont include it in the list.

As I am typing this, I have the L5639 in the SR-2.... Mind you windows is still installing updates, so no overclocking done. I should be able to answer for the 3.6 later today or tommorow.
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Old November 26, 2010, 06:48 AM
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And Xeven ran it on another asus board.
Would that be the asus p6x58d-e mobo I just bought off him?
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Old November 26, 2010, 06:59 AM
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Originally Posted by 3.0charlie View Post
Check this thread out, it has all your answers vs. the SR2: SR-2 Optimization Thread - [H]ard|Forum

I'm surprised that some X58 boards can't run the Hexa cores; not even after a BIOS flash to the latest?

ppd/w is the best with the SR2; expect over 100k ppd average and ~550w power consumption under load.
I appreciate the link, but not really wanting to read 37 pages of bios config talk (I read the first 5 pages.. and gave up) Is there specific reference to the Gigabyte or ASUS boards I have, or comparisons on two single boards vs. SR2 setups?
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Old November 26, 2010, 07:26 AM
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Not exactly for the L5639 but it should be the same. L5640 "special" - confirmed motherboard compatibility thread - [H]ard|Forum
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Old November 26, 2010, 07:34 AM
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Just a thought, getting the L5639 out of California can be pricey. By my tally it adds $150 to the cost of $450. I was looking at one but at that price have decided against it.
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Old November 26, 2010, 07:58 AM
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Originally Posted by stoanee View Post
Just a thought, getting the L5639 out of California can be pricey. By my tally it adds $150 to the cost of $450. I was looking at one but at that price have decided against it.
You could always get the shipper to make the value of it lower than it is. I have a pair of E5649's arriving today, I sure hope I don't get dinged hardcore on duty.
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Old November 26, 2010, 08:31 AM
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According to the shipper, the use of a credit card adds 17%=$76.50, ( I am out of town so my only option right now) shipping Fed-Ex=$44.00 and according to another forum member taxes approx. $30.00. YMMV. Road trip to California anyone? I'll split the gas and beer money!
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Old November 26, 2010, 08:32 AM
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Yeah I was hit for 150 $ because he declared 950 $ worth of CPU. Ask for lower value, you wont get the duty..
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