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What to buy: DDR2 800 at 4-4-3-8, or 1066 at 5-5-5-15 ?
- Thread starter Ken B.
- Start date
- Joined
- Jun 19, 2008
- Location
- Folding for T32 in Lawrenceville, Ga
If you're not OC, I believe the 800 will provide best results,
![Rich'[ard]](/forums/data/avatars/m/81/81732.jpg?1626886362){kind=avatar}
- Joined
- Apr 28, 2008
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- Melb, AUS
1066mhz 5-5-5-15 is equal to 800mhz 4-4-4-12, so i guess the 800mhz kit would be better.
do you mean you won't OC your ram or your cpu? because you could easily get either speed you wanted with either kit.
do you mean you won't OC your ram or your cpu? because you could easily get either speed you wanted with either kit.
- Joined
- Jun 19, 2008
- Location
- Folding for T32 in Lawrenceville, Ga
?1066mhz 5-5-5-15 is equal to 800mhz 4-4-4-12? Rich, what do you mean.. Frequency and timings are completely different. Assuming he's got a bus speed of under 400mhz the lower timings will always win.
- Joined
- Sep 5, 2008
Theoretically, 800 4-4-4 is the same as 1066 5-5-5. But if you test both ways (at least with Intel processors), you'll probably get better results with higher speed over lower latency.
With AMD, I'd get the lower latency.
With AMD, I'd get the lower latency.
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- Apr 28, 2008
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- Melb, AUS
oh sorry, forgot to check if he was AMD or Intel 
and they're around the same performance anyway. i tried booting with both speeds and timings, and not much diff. that's with my system anyway. i'm not clear on how AMDs operate, but i know the RAM performs differently on AMD.
and they're around the same performance anyway. i tried booting with both speeds and timings, and not much diff. that's with my system anyway. i'm not clear on how AMDs operate, but i know the RAM performs differently on AMD.
- Joined
- Jun 19, 2008
- Location
- Folding for T32 in Lawrenceville, Ga
See, I'm not seeing where you come up with 'they're the same' bus speed, bandwidth, and latency timings are different. Looking at my system. with a 400mhz fsb, if i run my ram at 800mhz with tighter timings, i get higher read, write, and access numbers than I do at 1066 with looser timings.
- Joined
- Dec 27, 2008
"Theoretically", he said. Memory speed is a product of both latency ("timing") and bandwidth. Slower timings are offset by higher bandwidth, as with the case of the aforementioned DDR1066. The math, apparently, works out the same. And as has been said, the DDR2 is capable of running at tighter timings when down-clocked to 800 mhz bandwidth. It's like do you want to move a pile of dirt with two front end loaders using 1 cu. yard buckets or one loader using a two cu. yard bucket. Theoretically, its a wash. Of course, in real computing tasks there may actually be a difference depending on what kind of computing you are doing. Some computing tasks will benefit from greater bandwidth and others will benefit from quicker latencies.
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- Sep 5, 2008
~10% for me 4-4-4 800 vs. 5-5-5 1066
- Joined
- Apr 28, 2008
- Location
- Melb, AUS
either my ram doens't give me different results, or Sandra XII or w/e the program i used isn't accurate enough.
i've tried 400mhz 4-4-3-10 and 500mhz 5-5-5-15 and there is only 0.5% difference. i have lost my screenshots and results, but i remember one had better latency and the other had higher read speeds. it's impossible to tell in real life though. although, i could probably find the answer if i did a 32M pi test.
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- Sep 5, 2008
I've found it does speed up SuperPi when using the higher speed.
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