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Oc'ing ram higher than cpu

post #1 of 10
Thread Starter 
Does Oc'ing the ram faster than the cpu really decrease performance?
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post #2 of 10
is that even possible o.O
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post #3 of 10
Thread Starter 
Quote:
Originally Posted by tkl.hui View Post
is that even possible o.O
Yes i mean like running cpu at 1400 fsb and ram at 1800 4-4-4-18-cr1

What did you do to get 3.6 i cant get it for the life of me
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post #4 of 10
Thread Starter 
i asked because there are threads in other forums that say running the ram faster than the cpu can have a decrease in performance
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post #5 of 10
You are talking about FSB/Memory ratio. There is potentially some truth to the idea that a 1:1 ratio is best, but only with NVIDIA chipsets.

Intel and NVIDIA's memory controlers work somewhat differently.

Intel's, though generally more efficent (especially in the area of memory copy performance) tends to have slightly higher latencies and applies the same kind of clock crossing procedure (the method by which the NB organizes transfers from the FSB clock domain, to the memory clock domain) to all memory ratios, even 1:1. So, in the case of intel, the 1:1 ratio is best used as a last resort, as in most cases, higher ratios are faster.

NVIDIA's controler on the other hand can skip the bulk of the clock crossing if you link the FSB and memory speeds. This is equivalent to a massive reduction in tRD and can only be done with the 1:1 ratio on an NVIDIA northbridge. This factor, combined with tight timings and the potential use of 1T command rate, make 1:1 a very viable option for boards with NVIDIA northbridges.

You should try things out your self to see what works best for you.
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post #6 of 10
With the intel's, o/c the CPU as high as you want/or can, then go back and o/c the RAM as high as you want/or can. It will not decrease your performance if you RAM is running faster that your CPU.
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post #7 of 10
Is there a point to where one should start trying to tighten the timings and stop increasing the ram speed?

Or better to increase ram speed as much as possible then see if it is possible to lower to timings at that speed?
post #8 of 10
In general tightening the timings will have a more significant performance in applications such as gaming than from increases from memory frequency and bandwidth, but you should benchmark your ram at it's highest frequency stable with loose timings vs lower frequency and tight timings and see which one results in greater success.
Edited by nettwerk - 5/25/08 at 1:54pm
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post #9 of 10
Quote:
Originally Posted by nettwerk View Post
In general tightening the timings will have a more significant performance in applications such as gaming than from increases from memory frequency and bandwidth, but you should benchmark your ram at it's highest frequency stable with loose timings vs lower frequency and tight timings and see which one results in greater success.
I guess I should just test it.... I keep reading different things.
post #10 of 10
Quote:
Originally Posted by Cletas View Post
Is there a point to where one should start trying to tighten the timings and stop increasing the ram speed?

Or better to increase ram speed as much as possible then see if it is possible to lower to timings at that speed?
It's always a combination of both, and neither can be neglected.

More MHz = more bandwidth, lower latency.
Tighter timings more bandwidth, lower latency.

One of the most important factors in the performance of your chipset/memory, with an Intel board, is tRD (performance level). The faster your memory runs relative to the FSB, and the lower the CAS timing, the tighter you can make tRD.

Generally, at around 400MHz FSB, you are looking for a tRD of 5-6; at ~450, 6-7; and at ~500, 7-8.

FSB and tRD being equal, a faster clock rate is almost always better than tighter timings.

For example with a 400MHz FSB, you can run at tRD of 5 with DDR-800 CL3, DDR-1000 CL4, and DDR 1200 CL5. The DDR-1200 CL5 will be faster, in bandwidth and latency, than 800 CL3, or 1000 CL4 (though the difference between 1000 CL4 and 1200CL5 is less than that between 800 CL3 and 1000 CL4).

If you were to run 1200 CL6, that would force you to a tRD of 6 at the lowest. In this case, you would be better off with 1000 CL4, so you could keep that tRD of 5.

If you have to sacrifice some MHz to get a CAS low enough to run a better tRD, do it. If you can sacrfice CAS for a jump in clock speed that gives you the same, or better tRD, do that.
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