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Memory Bandwidth vs. Latency Timings

@ 2003/11/12

Quote:

While bandwidth is still very important to the Intel Pentium 4, it's not as important as it once was in the i845PE days of single channel memory controllers. Thanks to the i865PE/i875P's dual channel memory controller things are much brighter. On average, the system with the memory running at 400 MHz (5:4 memory divider enabled) with aggressive memory timings performed 2-3% faster than the system using high speed memory with loose timings.

so get yourself some BH5-chipset memory for christmas this year! (I head OCZ is producing them a-new)

Comment from calantak @ 2003/11/13

you should have the highest possible stable 2-5-2-cas2 overclock
dual channel and test it with 1:1, with 5:4 and with 1:1 cas 3 4-8-3, that would give us the most info on what to think of this whole situation...in 3dmark01 runs that'd take only 10 minutes tops

Comment from RichBa5tard @ 2003/11/13

i'll test it at 250 with a single stick twinmoss, and at 238 with 2 sticks mushkin tonight if i find some time

Comment from calantak @ 2003/11/13

and 230 5-2-2 cas 2 versus 230 6-3-3 cas 2.5 and even 7-4-4 cas 3

please compare

Comment from RichBa5tard @ 2003/11/13

On my IS7:
240 1/1 6-3-3 cl2: 92xx mem marks
265 4/5 5-2-2 cl2: 10xxx mem marks

Comment from calantak @ 2003/11/13

coz that is what's important... running 1:1 at cas 3 4-8-4 at that speed could mean 1% with cas 2 2-5-2 or it could mean 5% which is a big difference

Comment from RichBa5tard @ 2003/11/13

Quote:

Originally posted by calantak so if I put my 3.0 that runs 240 fsb on 5:4 and increase the timings (now it's at 3 4-4-8) I'll get the same power?

yes.

Quote:

and if you find ram that can run that 240 @ 2, 2-5-2, will the increase at this speed be worthwhile?

Good question.

You could try my mushkin level 2 if you didn't live at the other side of the country.

Comment from calantak @ 2003/11/13

so if I put my 3.0 that runs 240 fsb on 5:4 and increase the timings (now it's at 3 4-4-8) I'll get the same power?

and if you find ram that can run that 240 @ 2, 2-5-2, will the increase at this speed be worthwhile?

Comment from RichBa5tard @ 2003/11/12

Yup. Has been a known fact for a long time for ppl who visit xtreme.

Comment from calantak @ 2003/11/12

if I get this right...
if you run your mem async lower with faster timings, then your pc will be faster then running it sync with lower timings even when the difference in memspeed is 50 mhz??

unbelievable!

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