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Overclocking memory

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Overclocking memory

Anyone up to speed on overclocking, and memory in particular?

I am running a matched pair of geil value memory at CAS 2.5-3-3-7 in ddr2 400 @ 215 mhz. This seems to be about the limit for this memory, any more and I cant boot into linux or windows. At the moment im running an athy 64 3500+, with the 215 mhz setting on the memory I am getting 2.37 ghz on it making it just a little slower than the 3800+. All this is running on a asus a8n sli.

I have been looking at the corsair twinx memory, which appears to have some aggresive cas timing on there - 2-2-2-5. Does anyone have any experience with this kinda memory, or anything similar which I can take up to say 230 mhz running at ddr400 without crashing the system.


The things Quake 4 makes you do Smiley
5 REPLIES
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Overclocking memory

So, you are aiming for DDR460 (PC3700ish), on a DDR400 chip...
I have not had very positive results from overclocking ram, they tend to only go to what they are stated. Managing to get DDR430 is quite impressive imo, but from my readings I havent seen anything that you require.

You may be able to get a DDR433 (PC3500, 216MHz) chip to do 230MHz if you are lucky, otherwise you'll have to take the plunge and get DDR500, but then you should easily get 250MHz, which is great for overclocking because your multipler will be 4 for your HT to run at 1GHz Wink that is of course assuming the CPU can manage that increase in speed!!

...any of that actually help at allHuh?

Cheers,
Dan
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Over clocking RAM Ivan

Hi,

I've met numerous people who have all started off talking very enthusiastically about over clocking techniques & tricks but ended up sticking to the more normal system tweaks and speeds after some time. The main problem reported was that if you over clock CPU's then this can have a knock effect's else where on the system as a whole. Its swings and round abouts what you gain in one area you loose big time in another.

And I've never even come across over clocking RAM ( and thats after many years in computing), I'm not saying its not possible but its certainly not common place as far as I can see otherwise more people would use this idea. Its not something that many people seem to talk about. Perhaps its a specialist technique that game players use or try?

Ivan
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Overclocking memory

My current system set up is an athlon barton 2500+, overclocked to the speed of a 3200+. This has been completely stable for almost a year. Basically if you want to overclock you need to plan what you buy beforehand. I bought that chip knowing that there was a good chance that there would be no problems effectively running it *as* a 3200+ chip, lucky for me there wasnt and no voltage increase was required, and I saved myself nearly £100.

all i needed to do was put the FSB from 166MHz to 200MHz, make sure I had 200MHz (DDR400) memory (though afterwards I noticed it only liked single sided RAMs) and it all worked fine. Clock speed increase from 1.8 GHz (ish), to 2.2GHz.

The easy overlockers *tend* to be the lower end of the spectrum of the particular processor model (mine was the slowest barton there was, and it went to the highest). The reason for this could be that they are all made in the same way, but the lower speed ones could potentially be of lesser quality than the fastest ones due to the manufacturing process. So the chip may not be able to do as fast as the 'higher quality ones', so they are given an appropriate speed to make sure they do work, however there is a chance that they will do as fast as the best, as was the case with many of the 2500+'s. The 2500+'s were also easy to overclock because the multipler was the same as the 3200+, it was just the FSB speed that was lowered, which makes it very easy to do - no messing required. In a similar way, it seems the AMD64 3000+ is also good for overclocking, but I havent personally tried this, and memory limitations make it difficult.

Thats the general impression I get anyway - it can work, but you need to plan, and you need to be lucky.

Dan

DISCLAIMER: NOTE THAT I DO NOT RECOMMEND ANYONE OVERCLOCKING ANY PROCESSOR, IF YOU DO SO IT IS AT YOUR OWN RISK AND COULD INVALIDATE YOUR WARRANTIES
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Overclocking memory

Well the cpu will support going up to 2.7 ghz, which gives cpu performance on par with an fx55. I have had to do this by clocking the memory down to 166, or even lower in cases.

this is really no good, as i dont get as good performance when running in ddr400 mode. I can take the fsb to around 230-235 mhz which will boost the cpu performance by about 20%, I just need to be able to have memory which will support being clocked at 230 mhz. I am assuming that pc3200 is prob not the best kind of memory to get, maybe pc4000 ?

Are 4000 and 3200 clocked at different speeds?
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Overclocking memory

4000 are capable of going up to 250mhz (DDR500), but of course clockable at anything lower than that! PC3500 is clocked at 216MHz. Check the DDR433+ catagory on the memory section of ebuyer Smiley

Dan