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What do I need to set my RAM to?

post #1 of 6
Thread Starter 
Currently I am running my ram at 750Mhz 1:1 ratio with 5-5-5-15-2T timings.

I'm using OCZ Gold Gamer something or another PC6400.

I still have little to no comprehension on how to work timings and ratios.

Anyone feel like pitching in some advice? I can't seem to get past 3.0 on my E6400.
    
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post #2 of 6
you should have the ram speed as twice the fsb (if the fsb is 333, then the ddr2 speed should be 667). lower timings are better, but just use the stock ones.
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post #3 of 6
Your E6400 has a multiplier of 8x, so to get past 3.0GHz at stock multi you would need to run 375FSB, which translates to 750MHz at 1:1. Since you are there right now, you should be running 3.0GHz. To increase speed, just increase FSB. Do note, however, that at 400FSB a new NB strap takes effect, which reduces your speed a lot. A strap is a set of Northbridge latencies which are like RAM timings, except much more impacting on general performance. There are only a select few motherboards which can take advantage of controlling straps, so with all others you must work your speed around the straps. For example, on the P5B Deluxe, the bandwidth (of what, I'm not exactly sure I remember) was tested for each FSB from 375 to 475 or something similar. The scores were high at 400, dropped at 401, and slowly climbed again and only surpassed the 400FSB scores at around 450FSB. So straps make your system take a huge performance hit. About your actual question, timings control the latency to and from your RAM sticks, but FSB is way more important. If your FSB can't be pushed any further, you might want to loosen timings because the performance hit from loosening the timings is negligible compared to the gain from faster FSB (which directly translates to faster RAM). You should only change the ratio from 1:1 if you're sure your CPU is holding you back, but your RAM is itching for more. The highest you can often set your RAM to is 2:1 RAM:FSB so if you run your E6400 at stock (266FSB), your RAM will not run at 533MHz, but at 1066MHz, twice that. However, it is pretty much pointless because if your RAM is running faster than your Northbridge, your Northbridge will be a bottleneck anyway. I hope I helped.
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post #4 of 6
Thread Starter 
Yeah this helped a lot.

What I dont understand though is in the Core Center settings in the BIOS I can only adjust the FSB itself (I.E. 1500 FSB translates into 375FSB Internal clock for the CPU)

Why I am unable to physically adjust the internal clock speed of the CPU is beyond me.

So if I take it up 25Mhz I'll hit a NB Strap that could severely limit my performance?
    
CPUMotherboardGraphicsRAM
E6400 2.13Ghz C2D OC'd @ 3.0Ghz MSI P6N SLi 650i Chipset eVGA GeForce 8800GTX 768MB GDDR3 2GB OCZ DDR2-800 PC2-6400 5-5-5-12 
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post #5 of 6
Quote:
Originally Posted by Nechen View Post
Yeah this helped a lot.

What I dont understand though is in the Core Center settings in the BIOS I can only adjust the FSB itself (I.E. 1500 FSB translates into 375FSB Internal clock for the CPU)

Why I am unable to physically adjust the internal clock speed of the CPU is beyond me.

So if I take it up 25Mhz I'll hit a NB Strap that could severely limit my performance?
To the first question:
Intel's FSB rating is actually a quad-pumped value. So at stock you run at 266FSB, or 1066FSB rated. At OCN, we don't really use the rated FSB often unless talking about new chips. Since 1500 / 4 = 375FSB, so you really are able to directly adjust the FSB. Some companies just use the rated, as their boards might be end-user oriented, where they might be disappointed that Intel said 1066, and their board says 266. LOL.

To your second question:
Yes, if you take it up another 25MHz, you'll hit a new strap. I'll find the review I was talking about.

EDIT:
Here's a graph:

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post #6 of 6
Thread Starter 
So do you think I should just leave it at 1500:750??
    
CPUMotherboardGraphicsRAM
E6400 2.13Ghz C2D OC'd @ 3.0Ghz MSI P6N SLi 650i Chipset eVGA GeForce 8800GTX 768MB GDDR3 2GB OCZ DDR2-800 PC2-6400 5-5-5-12 
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CPUMotherboardGraphicsRAM
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