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V8 Optimized App
Jason G:
Hi again,
Do the FB-DIMM RAM sticks have 9 x chips (single rank), or 18 x chips (dual rank) per stick ? [This could be important] Either way You are beating the listed 5000 chipset reference machine. You might squeeze some more performance out looking at the timings ... [but remember that every benchmark software is different and only synthetic, I think they design them to defeat the Ram buffers making FB Dimm look slower, when in real applications they could be faster for some things]
I remember reading the Mac Pros like to run fastest [low latency, but less than maximum bandwidth] with 4 x dual rank fb dimms. they said that loading all 8 slots added some latency but gave more bandwidth.
NOTE the slower EVEREST benchmark shows you are running single channel! If that isn't an Error in Everest, you need to fix that if you haven't already! the sandra one looks OK so I can't see a reason for it.(maybe Check BIOS anyway - dual channel, interleave, and the branch mode I think too)
Have you maybe got Boinc running during the benchmark?
What does CPU-Z say ? (cpu pages and Memory Pages ?)
just remember the opterons seem to be using consumer DDR2 not server FB Dimms [ Or could they be RAMBUS RIMMS ? $$$ :o] , and have on die memory controller. (that's for playing games isn't it? , :P , Maybe if seti could use all the memory bandwidth then there would be more opterons in the top 100 computers list )
Jason G:
I Just realised another possibility why maybe the slower Everest Benchmark. It is possible driving the memory hard you get more correctable ECC Errors. the correction adds some latency I think. Maybe if you back off on the RAM a bit and check its cooling it might actually speed up some more. I think memtest86 [But don't know for sure] should show if ECC error correction is happening a lot.
RottenMutt:
--- Quote from: j_groothu on 18 Oct 2007, 02:15:07 am ---
It is possible driving the memory hard you get more correctable ECC Errors. the correction adds some latency I think.
--- End quote ---
bios logs ecc errors and it hasn't with the new memory. i'm wondering if the current bios has something wrong???
--- Quote ---Do the FB-DIMM RAM sticks have 9 x chips (single rank), or 18 x chips (dual rank) per stick ?
--- End quote ---
dual rank i do believe
--- Quote ---NOTE the slower EVEREST benchmark shows you are running single channel!
--- End quote ---
why do you say that? i suspect it may be true.
--- Quote ---Have you maybe got Boinc running during the benchmark?
--- End quote ---
no
--- Quote ---What does CPU-Z say ? (cpu pages and Memory Pages ?)
--- End quote ---
cpuz doesn't say much of anything
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RottenMutt:
memory tab
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RottenMutt:
Everest spd info shows 2 rank
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