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V8 Optimized App
RottenMutt:
I was thinking that dual channel would bond two dimms to a single memory address for a 128bit word, and i though sandra would report it that way...
and for 5000x would yeild two 128bit channels...
Jason G:
if they did that, that would make single channel 128 bits :D, we want dual 64 bit channels
If 1 memory address accessed 128 bits instead of 64, then I think the programs would have to change too[ and the sockets would need more pins I think]. Yes it is accessing 128 bits at a time.
Dual Channel = 2 separate 64 bit channels in paralell, doubling the bandwidth in the controller giving effective bandwidth of 128 bits. At a guess I don't think , gluing 64 bits from one channel, to the other 64 bits channel, and synchronising the two channels, would be any more efficient that one channel + one channel, but then again I'm not a motherboard designer :D
Jason G:
Anyway, Are your paired modules in matching slots? and dual [or must be dual interleaved at that bandwidth?] channel mode set in Bios?
[ It looks like you are running Dual Channel Interleaved correctly to me (maybe not check BIOS). That~12 GB total memory bandwidth looks like a lot more than DDR2 dual channel mode... but should you be higher?]
for PC2-5400 DDR2-SDRAM, roughly theoretical:
--- Quote ---DDR 2 single channel ~5 GB/s
DDR 2 dual channel ~10 GB/s
DDR 2 dual channel interleaved ~??GB/s, Dual channel + a bit extra
--- End quote ---
[Just looked at the manual for your mobo, looks like you have them in the right sockets, and it wouldn't work any other way, EEEK, they are all the same colour :o ]
--- Quote ---Interleaved memory is supported when pairs of DIMM modules are
installed in both Branch 0 and Branch 1.
--- End quote ---
which you have so I think it's good to go. [You'll want to check the 'Branch Mode" setting in BIOS is set to "Interleave" though] I would test with memtest86+ and look at the speed with different interleave ratio settings to find what's fastest ( 1:1, 1:4 etc..)
RottenMutt:
new memory, but still not much better...
why is everest memory reads slow?
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RottenMutt:
Sandra memory benchmark
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