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RAM: Latency vs Speed???

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January 5, 2010 11:27:18 AM

RAM: Latency vs Speed???

Hi guys, just confused in selecting right ram for my rig. With my budget I can only choose one thing. Either better latency or better speed. Can’t afford both. No Plan of OCing at this stage

So here are the choices:

CORSAIR XMS3 6GB (3 x 2GB) DDR3 1333. Cas Latency: 7. Timing: 7-7-7-20. Voltage: 1.5v Model:TR3X6G1333C7 G

CORSAIR XMS3 6GB (3 x 2GB) DDR3 1600. Cas Latency: 8. Timing: 8-8-8-24. Voltage: 1.65v Model:TR3X6G1600C8 G

I do HD video editing. NO GAMING AT ALL. Which one will perform better. Any feedback will be highly appreciated.

System Configuration:
Processor: i7 920 (OCed 3.8Ghz)
Mobo: Asus P6T
GPU: ASUS Radeon HD 4670
PSU: Corsair 550w Modular HX550

Thanks in advance

More about : ram latency speed

January 5, 2010 3:34:28 PM

Personally I would just go with the 1333 since tripple channel memory on the i7 is crazy fast already and doesn't increase overall performance a whole lot.

Also, the slower memory will run cooler.

Someone else who tinkers more with overclocking/etc might know a bit more about the positive and negative but most benchmarks shows very minor differences.

Anyone else?

edit: Also, the reduced latency on the 1333 will hide a good chunk of the reduced bandwidth.
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January 5, 2010 6:40:35 PM

I like low latency, vid edits.
Unless the start up and getgo is perfect, one will be waiting a long time for stuff to get along from brand new, the higher the latency. lower latency helps this...and the speed stuff. I still call it multithreaded theory.

I am still content with a prescott, double dual channled hyper threaded, at 6.4gbit (hmmm..verified)..3337 timings, WITH ECC enabled..figure that one out...
This could be a place to mention agp and the magic there too.. :whistle: 

any after windows market editor has to lay the games of putting it together. Keeping it tight is the best bet and always will be.
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January 6, 2010 11:18:29 AM

Judging from the part numbers, it's probably the same RAM - meaning it all rolled off the same assembly line. Some parts were just a little faster, so they were binned - and priced - higher.

I'd save my money and buy the 1333 parts.
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April 10, 2013 1:14:39 PM

for both amd and intel, the highest speed with the tightest timing possible would provide the best results.
now there are a few limitations, amd x4 will crap out around 1900mhz, so you would need ram that can get the lowest timing e.g.7-7-7-21 at round 1800mhz. the best ram for this would be some good micron D9KPT @ 2V.


amd x6 will go to about 2200-2300 depending on how good its imc is
for that you want timings like 8-8-8-24, or you can try for 2000mhz 6-6-6-18. the only ram that can do this is elpida MGH-E.

now intel quads have a probem running high voltage memory. unlike the amds, so its pretty much limited to 1.9V if you know what your doing and 1.65 for the nub cakes. its also limited on how much voltage you can give the imc without killing it ~ 1.45V. most D0 stepping intel chips can run 2000-2600 unless your one of the few unlucky people or you just dont know what your doing. for the 2000-2300 range elpida MNH-E/MGH-E are the only ram that can do it with reasonable voltage and timing. there is also the cheaper samsung HCH9, and Elpida BBSE that can do about 2200-2300 with 8-9-8-24 timing with 1.7-1.85V for the ones feeling brave. and last is PSC that can do 2300-2600 with some ugly loose timing that end up being slower than the others in the end, but they are cheap.

the intel 6 cores are the same as above only its not worth going higher than 2000-2300 due to the 1.5x multi on the imc.
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