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DDR2 RAM Speed? - Page 2

post #11 of 27
Yes usually 1:1 is ideal but test...test...test
    
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post #12 of 27
Thread Starter 
Quote:
Originally Posted by RADEON View Post
Lower latencies are faster at a given clock speed than higher latencies, but higher latencies allow higher clocks. Usually, the best method is to run high latencies to find you maximum ideal overclock. If your maximum overclock is not RAM limited, then decrease the latencies to gain a little extra performance.

Use sisoft sandra to test raw ram bandwidth to find out whether a 1:1 RAM divider is faster than the 666 MHz divider. Some chipsets don't mind so much. Others, like mine, actually perform worse with the asyncronous divider.

In Sandra, my system made 2900 MB/s with a 1:1 divider, 574 (overclocked) FSB, 4-4-4-10 timings. With the divider set to run the RAM at 667 speeds, the throughput decreased to 2600 MB/s running the same 4-4-4-10 timings, even though the RAM was technically running faster.
So I stayed with the 1:1 divider. Since the clock speed is nice and low, I am able to run the timings at 3-3-3-8 and drop the command rate to 1T. This bumped my Sandra score to 3000 MB/s. Clearly the best choice! Hope this clears things up.
Thanks, Just downloaded sandra and got 5592 MB/s I'm going to mess around with my timings tomorrow and see what I get.
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post #13 of 27
Your ideal RAM speed is theoretically 2x your FSB, practically it is more than that because your ram communicates with more than just the CPU. However, it is impractical that you will achieve a 2:1 ratio with current DDR2 modules.

Therefore, attempt to achieve the highest rated memory speed you can for maximum performance.
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post #14 of 27
Thread Starter 
Can I mess things up If I try to run my ram at 3-3-3-8?
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post #15 of 27
Generally your system will fail to POST if the RAM settings are too aggressive. At worst, you should just need to do a CMOS clear. Just be sure not to crank your voltage up too high as that could cause damage and/or void warranty.
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post #16 of 27
I heard that if your RAM is doubled FSB preformance can also go up. As in 266Mhz FSB have your RAM at 533Mhz (DDR2-1066) or as close as possible. Doing this will match the bandwidth of your CPU's L1(or L2 forgot) cache.
     
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post #17 of 27
Quote:
Originally Posted by GigaByte View Post
I heard that if your RAM is doubled FSB preformance can also go up. As in 266Mhz FSB have your RAM at 533Mhz (DDR2-1066) or as close as possible. Doing this will match the bandwidth of your CPU's L1(or L2 forgot) cache.
Exactly.

However, because your memory has some error correction and other communications build in, slightly higher than double will maximize your processors bandwidth.
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post #18 of 27
Quote:
Originally Posted by pauldovi View Post
Exactly.

However, because your memory has some error correction and other communications build in, slightly higher than double will maximize your processors bandwidth.
Either 1:1 or 2:1 is ideal. Anything different is going to induce some extra delays.
The FSB and the RAM speed are two separate busses that have to comunicate with each other inside the chipset. If they are running off the same base clock, or some even multiple of it, corresponding clock cycles automatically match up. Think of it as tapping one finger at 2 times a second and the other at 2, or 4; different speeds, but they still match up. Running the RAM at an odd divider, like 2:3, induces extra latencies, since info has to go between two totally unrelated clocks. Try tapping one finger 2 times a second and the other at 3 times a second. It's doable, you just have to think really hard about it. Same with the chipset. It has to somehow take bits comming in at a certain rate and sync them to a totally different rate.

This is what separates the men from the boys when it comes to chipset performance. The high end chipsets are very fast at doing these asyncronous transfers, where cheap ones aren't. Back in the old days of Socket A and 370, chipsets at the time were horrendously bad on asyncronous RAM dividers.

Just test, test, test, and see what works best. Like I said before, even if you break even with RAM performance at 666 vs 533, go with the slower speed. You can then run faster timings and outperform your base performance mark.
    
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post #19 of 27
Quote:
Originally Posted by RADEON View Post
Either 1:1 or 2:1 is ideal. Anything different is going to induce some extra delays.
The FSB and the RAM speed are two separate busses that have to comunicate with each other inside the chipset. If they are running off the same base clock, or some even multiple of it, corresponding clock cycles automatically match up. Think of it as tapping one finger at 2 times a second and the other at 2, or 4; different speeds, but they still match up. Running the RAM at an odd divider, like 2:3, induces extra latencies, since info has to go between two totally unrelated clocks. Try tapping one finger 2 times a second and the other at 3 times a second. It's doable, you just have to think really hard about it. Same with the chipset. It has to somehow take bits comming in at a certain rate and sync them to a totally different rate.

This is what separates the men from the boys when it comes to chipset performance. The high end chipsets are very fast at doing these asyncronous transfers, where cheap ones aren't. Back in the old days of Socket A and 370, chipsets at the time were horrendously bad on asyncronous RAM dividers.

Just test, test, test, and see what works best. Like I said before, even if you break even with RAM performance at 666 vs 533, go with the slower speed. You can then run faster timings and outperform your base performance mark.
This is not true. There are no tapping figures inside of a NB.

Read this:

Quote:
A few quick benchmarks proves this:

FSB = 200
Mutliplier = 9
CPU Speed = 1.8Ghz

@ 1:1 DDR2-400 4-4-4-12 Memory bandwidth = 3224MB/s
@ 2:3 DDR2-600 5-5-5-18 Memory bandwidth = 3774MB/s
@ 1:2 DDR2-800 5-5-5-18 Memory bandwidth = 4047MB/s
A lot more here.
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post #20 of 27
Thread Starter 
Ok I did some testing.

at 667 and 4-4-4-12 I get 5773
at 667 and stock 5-5-5-15 = 5641
at 533 and 4-4-4-12 I get 5592

So It looks like 667 at 4-4-4-12 gives the best performance.

I tried 533 at 3-3-3-8 but it wouldn't post.
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