Author Topic: Memory overclocking..  (Read 679 times)

[SJ]Jarkko Rantajoki

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Memory overclocking..
« on: November 01, 2008, 08:59:48 am »
What would you prefer.. To have lower timings but stock clocks.. or have a tad tighter timing with more clock? Well in other words..

How much latency will effect actual performance?
Im bit puzzled.. Going for OC raising timings the read/write is much faster, but latency is bigger..
and other way around read/write is slower but latency smaller.
 :?:

I noticed my CPU stepping aint working correctly.. it didnt raise the multiplier even when running super pi so i had to set it manually to 9.. thought id overclock while i was at it.. and then the memory issue occurred.. well not really an issue.. i just wanna know which is better option for actual performance with the mem. (might drop the clocks to get tighter timings if thats better)

(runs stable close to 1000mzh on 5-5-5-15 timings.. but i reckon i dont get much higher than stock Mhz with the default timing which for my mem is 4-4-4-15)
« Last Edit: November 01, 2008, 09:08:38 am by [SJ]Jarkko Rantajoki »

[SJ]Tysmyster

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Re: Memory overclocking..
« Reply #1 on: November 01, 2008, 10:00:45 am »
Hey Jarkko,

I have quite a bit of experience with this actually, and it seems that memory manufacturer's have finally decided that memory megahertz speed is more important than low latencies.
You can see this because newer types of memory have way higher latencies and also higher clock speeds.  In other words, if you can run at 1000mhz with 5-5-5-15 timings that is great, I have 4-4-4-12 memory myself which is 800mhz but I run it at 950mhz with 5-5-5-15 myself. Will give you more bandwidth than lower frequency with tighter timings will.
I always use Sisoft Sandra to measure memory bandwidth when I play with this stuff. Definitely get more out of your memory by cranking up the frequency and keeping the timings loose so the memory won't crap out. Of course you still want your latencies to be as low as possible but if you have to sacrifice something, sacrifice latency and not frequency.

Also, make sure to have your memory run 1:1 instead of with a divider and try to keep it at 1T although that might be a problem when overclocking. I've had to sacrifice 1T myself I think.


[SJ]Jarkko Rantajoki

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Re: Memory overclocking..
« Reply #2 on: November 01, 2008, 05:05:39 pm »
Seemed to run not too good on 1:1 divider.. Didnt raise voltage at all  yet, so thats possibly effecting.. but heres an interesting thing.. With higher FSB and tight timings.. but little less clock on the memory i reached the best benchmark result so far.. stability is a question mark of course.. but ill let it run like this for the evening. (btw i use Everest for memory benchmarks)

[SJ]Jarkko Rantajoki

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  • Posts: 12811
Re: Memory overclocking..
« Reply #3 on: November 01, 2008, 05:22:03 pm »
Well.. now running 3,7Ghz and 830Mhz 4-4-4-15 and best benchmark result so far.. soo.. i guess im gonna run like this for tonight and quit fiddling with it.. Hopefully is stable.
lol

EDIT:Some results for mem.

Read 8104 MB/s
Write 8827 MB/s
Copy 8594 MB/s
Lag 61,4 ns
« Last Edit: November 01, 2008, 05:34:21 pm by [SJ]Jarkko Rantajoki »