OK, I now have one of each. I threw the 920 together today and got it clocked up to 3.7 gig to match the 860 rig reported in the 1156 thread. Then, I took the 860 and matched the multiplier of the 920 (x20), put the QPI multi back to x18, so now the rigs are configured exactly alike. I'm running HFCC on both rigs to.
My plan is to analyze the c**p out of these with respect to power, PPD and WU production, and cost. Some of that, with detailed hardware list will come in later posts. What I want to show here is the setup screenies.
Emu is doing the same thing but at 4 gig with HFCC. This should get interesting...
First, the build pic, if it can be called that....
The 920 is on the left, the 860 on the right. And I'll say again, those Zalman 10x extremes are working REALLY well. Of course, they both have ICD7 paste on them....
OK, setup screenie of the 860 rig first. This is different and updated from the one I posted in the 1156 thread, but at the same CPU clock speed. It has lower CPU multi, higher bclk, and higher QPI speed.
Here's the screenie of the 920 rig. I had to do this in two pics since I'm running an old PCI virge card in it...This is on an MSI Platinum SLI board.
There was a trick to getting it to bios overclock since it has this set of dip switches for "automatic" overclocking. It was set default to on and kept overwriting my bios settings... Of course, I could find nothing in the manual on how to disable it. I just tried putting all the dip switches in the off position and that worked..... After that, the clock came easy. I have a good amount of margin left in this board so I should end up at 4 gig when all is said and done. This will be part of the power analysis. I want to establish the "sweet spot" on both rigs.
OK, so both are crunching away, I should have initial PPD/production results in a few days. I got curious when jcool posted data that indicated one of his 920 rigs was producing significantly more WUs per day than my 860.
Now I have a 920 "control" to compare the 860 to. (At least that's my excuse for buying it... Add that to the fact that I picked up an extra PSU a few days ago and it was getting lonely....)
The 860 was pulling 183 watts, Boinc loaded. I'll have to check that again since I changed the QPI around. The 920 is pulling 224 watts Boinc loaded. These are just initial figures. I'll put more detail around this later.
The BOINC bench on the 860 is 3,376/11,851. The 920 rig is 3,382/10,853.
I would also say to disregard the estimated completion WU times on both rigs. The 860 just got a batch of new HFCC WUs, it was running HCC. The 920 rig has not completed any WUs yet so it doesn't really know what the real times should be. I expect that to come down into the 4 hour range.
Wow, busy day today, and more hamsters in the stable. That will teach me to buy a power supply....
Bob
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