clock kits

I'm looking at RAM for a P35 chipset build I'm going to do in the near future. I'm currently pricing out stuff so I can watch sales and buy later.

The motherboard I'm going to use is the GA-P35-DS3R from Gigabyte, and although they have a list of approved RAM modules that will work in the system, it's not totally up to date (ie they only list like 2 2GB modules they've tested). I was interested in a 4GB Kit (2x 2gb).

So what's better? DDR2 1066Mhz 5-5-5-18 or DDR2 800 4-4-4-15? I'd be gaming on this PC.

Also, I haven't seen any DDR2 1066 ram with a CAS of 4. Am I just not looking hard enough or does it not exist?

I know you can get DDR2 800 with latencies of 4-4-4-12 for dirt cheep. Go for the DDR2 800 with real tight timings. DDR2 800 has been around long enough to mature. The price performance ratio is the best ever.

The slightly higher cas latency on the 1066 will be offset by the higher frequency. I would go with a slightly lower CAS latency, and a higher ram frequency myself. As the speed of the chips keep increasing, the importance of CAS latency timing is dropping. This is why I think you will be smarter going with a higher frequency chipset.