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RAM speed/timings

post #1 of 18
Thread Starter 
Alright, now that I have my cpu stable (finally), I want to go back and tweak the RAM. I can either run it at 800Mhz @ 4-4-4-12-1T, or, I can run it at 850Mhz 5-5-5-15-2T. Which would give me faster performance? Both settings are stable at 2.0v, which is where I'd like to leave it.
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post #2 of 18
run some bechmarks and you tell us
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post #3 of 18
It's hard to say exactly, especially considering both the timings and frequency are fairly close. The only way to know for sure is test it out with some benchmarks or games. I would imagine the results to be fairly similar.
    
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post #4 of 18
Like others have said, becnhamrk to find out for sure. But the 800MHz at 4-4-4-12-1T is most likely the better option. A 50MHz increase is only a 6.25% increase in speed, but the timings were increased by about 25%. So the benefits didn't outweigh the cost. The math isn't actually that simple, but it gives you a rough estimate.
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post #5 of 18
Thread Starter 
I thought the general rule of thumb is that higher MHz prevails, reguardless if it's running w/ high timings. Also, I just restarted, went into BIOS, and am able to to run the ram at 917Mhz @ 5-5-5-15-2T, on 2.1v. I just played a couple rounds of COD4, and no problems with the RAM at that speed. I think it's safe to assume that 917MHz @ 5-5-5-15-2T, is gonna be faster than 800Mhz 4-4-4-12-1T?
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post #6 of 18
Is It PC6400 RAM?
    
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post #7 of 18
Thread Starter 
Quote:
Originally Posted by thebest View Post
Is It PC6400 RAM?
Yes.
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post #8 of 18
Kinda of a question I always wanted to ask, but never really had the time to tweak RAM in order to actually compose a question as such.

A related question: considering your CPU is the one you want to OC over the RAM, you'd want your RAM be your bottleneck vs the CPU, right? Basicaly, my CPU won't get past 2.95 GHz, and my RAM at it's best considering FSB and dividers is 492. With different multi and FSB, I can get this RAM to about 530MHz, which of course takes my CPU to about 2.75 GHz. So in this instance my CPU is the bottle neck. I'd be better off with a better OC'ing CPU, so I can push the CPU AND get the RAM to it's max, right? I've been considering going to a 5000+ BE so I can get past 3.0GHz for poops and giggles. Considering I have nothing better to blow my money on (after another 2 gigs of RAM and a 3850), do you think I should? Sorry for the short story.


P.S. I kinda-sorta answered my own question with all the rambling huh?
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post #9 of 18
Quote:
Originally Posted by Diabolical999 View Post
I thought the general rule of thumb is that higher MHz prevails, reguardless if it's running w/ high timings.
Not necessarily. Think about this example: Say you underclock the memory's frequency to 650MHz but lower the CAS latency to 3, running timings like 3-3-3-8-1T. Then you increase the frequency, and at 750MHz, you have to loosen the timings to 4-4-4-12-2T. Then you continue to increase the frequency, and at 925MHz, you have to loosen the timings again to 5-5-5-15-2T. Now at 925MHz, 926MHz, etc you're at slowest speed that still requires the high 5-5-5-15-2T timings. Compare that to a speed like 745MHz, where you're at the highest speeds that can still run at the very tight 3-3-3-8-1T timings. The 745MHz at 3-3-3-8-1T would probably give more bandwidth and lower latency than the 926MHz at 5-5-5-15-2T. But it's rare that the dividers work out that way, just saying, it's not always going to be the case that the higher speed is the best option, though more often than not it's true. Everest is a great tool for testing the two options, I'd recommend running that and comparing latencies.

Quote:
Originally Posted by Diabolical999 View Post
I think it's safe to assume that 917MHz @ 5-5-5-15-2T, is gonna be faster than 800Mhz 4-4-4-12-1T?
Is it ever safe to assume? Haha. This is a much closer contest than before, I'd definitely test to see which gives the most bandwidth and lowest latency. I'm going to guess 917MHz but I think this will be a close one.

EDIT:
Quote:
Originally Posted by michinmuri View Post
Kinda of a question I always wanted to ask, but never really had the time to tweak RAM in order to actually compose a question as such.

A related question: considering your CPU is the one you want to OC over the RAM, you'd want your RAM be your bottleneck vs the CPU, right? Basicaly, my CPU won't get past 2.95 GHz, and my RAM at it's best considering FSB and dividers is 492. With different multi and FSB, I can get this RAM to about 530MHz, which of course takes my CPU to about 2.75 GHz. So in this instance my CPU is the bottle neck. I'd be better off with a better OC'ing CPU, so I can push the CPU AND get the RAM to it's max, right? I've been considering going to a 5000+ BE so I can get past 3.0GHz for poops and giggles. Considering I have nothing better to blow my money on (after another 2 gigs of RAM and a 3850), do you think I should? Sorry for the short story.


P.S. I kinda-sorta answered my own question with all the rambling huh?
I don't think it's worth the money. Memory speeds aren't going to impact your system all that much, at least not the gains you're looking at. With the 5000BE you're looking at speeds of 3.2-3.5GHz, which would be noticeable but it's not going to be mind blowing. Plus you're going to lose half your L2 cache. You'll probably get a few more FPS in games that you're already getting more than enough FPS in. I don't think it's going to make the difference between not being able to play a game with your current rig and suddenly being able to with the 5000BE, so what's the point ya know? Other than bragging rights to be over 3.0GHz and the fun of overclocking a new chip, which is more than enough reason for many here haha. If it were up to me, I'd save my $100, but of course it's not up to me, it's up to you
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White Whale
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post #10 of 18
Quote:
Originally Posted by Diabolical999 View Post
Alright, now that I have my cpu stable (finally), I want to go back and tweak the RAM. I can either run it at 800Mhz @ 4-4-4-12-1T, or, I can run it at 850Mhz 5-5-5-15-2T. Which would give me faster performance? Both settings are stable at 2.0v, which is where I'd like to leave it.
here's something I found out today. I used to have my comp Oc'd with a x9 multi. My RAM was at specs in sig. I recently changed the multi to 11. Still the same CPU speed, aout 2-3 MHz difference in RAM speed, but I am now running a 5-5-5-15 timing vs 5-5-5-16. Just goes to show that the way you set up FS/multi can affect it, too. Still have to see if I can tighten them further, ut at least I made this one tiny bit of progress. And durch, thnx as always.

P.S. RAM is now at 491.5. That's 1/2 a MHz loss for one tighter timing. This is probably worth it.
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