I've just successfully built my first system, running Vista Ultimate x64 and based on a Gigabyte D3SL mobo, Q6600 and Kingston pc-8400 ddr2. I've been trying to set ram and wanted some advice. I found I had to manually set ram to 4.0A multipler to run it at 1066, as it defaulted to 800mhz. At the same time I set timings to 5-5-5-15. This caused some failed boots. I increased voltage further from 2.1v to 2.2v but that seemed to make my case fan operate at a much higher rpm - any thoughts, is this normal?
I'm wondering, between ebuyer and what's on the ram packaging, which is correct? Ebuyer stated 5-5-5-15, and that it is 1066 ram. But are those timings perhaps only valid if you run it at 800mhz? I'm trying to work out what's right or if I have ram not as good as advertised, just have no experience here!
I wouldn't mind, but there was quite a price hike over 800 ram.
What I've done now having read a bit more on this site is set the ram to 4-4-4-12 T2 at 800mhz. This it seems happy with and is achieving at 1.8v no problems, making for a very stable set-up. Should I just keep it here, as the timings were something like 5-7-7-18 when I pushed it to 1066mhz?
My other query is fsb > dram ratio, which is now at 2:3. I've heard folk say 1:1 is best.
In order to achieve this, I presume I will need to bump up the fsb, and still further if I did want to run the ram at 1066? Then I guess it's a question or reducing your cpu multiplier from 9x to something sane that doesn't fry it? (I'm on stock cooler for now)
Thanks for your thoughts, as a new system builder I appreciate all insights.
In general, PC2-8500 is overclocked PC2-6400 anyway.
Before making any more changes, download and run CPU-Z
and tab over to "SPD", then write down every option.
You may see a column for EPP or XMP: those will be
the highest frequency settings recognized by the factory.
Then, browse the Internet by searching for stable
overclock settings with your memory and your motherboard.
Very often, reviews of that motherboard will have
reported stable memory settings for the highest
SPD option available, possibly also using your memory.
Also, your motherboard vendor's website should have
a User Forum where memory overclocks are discussed;
likewise, Kingston is a very reputable memory manufacturer
and they may be able to recommend stable BIOS settings
for that motherboard e.g. tweaking voltages for maximum
stability / maximum OC / etc.
There is nothing particularly sacrosanct about a 1 : 1 FSB : DRAM ratio:
some people just think it's better with Intel chipsets, but I haven't
seen any convincing arguments to support that theory.
Proper cooling is far more important that a synchronous ratio.