DDR2-latency or bandwidth?

I'm going to be upgrading the RAM in my Asus v6v very soon. It currently has 512 MB and I would like to fill it up completely with 2GB.

My question is this: Should I spring for DDR2-400 CAS3 or DDR2-533 CAS4? I'm aware that the Pentium M cannot fully utilize the bandwidth offered by even single-channel DDR2-400, however, what about the video card? This computer has an Ati Mobility Radeon x600 GPU in it. I believe that it will allocate system memory as a frame buffer, meaning that faster RAM could possibly provide higher framerates. Faster RAM with a higher latency could slow the CPU down though. So which way should I go? Is my assumption regarding the video card correct?

 

After extensive testing I found that both the 855 and 915 chipsets seem to have a mind of their own. Dont matter if you use the most expensive or the cheapest ram you are getting almost the same bandwidth which leads me to deduce that centrino determines timing how it wants nothing to do with what the module is capable of

 

I'd go for the DDR2-400 - lower latency will make more of a difference than a small RAM clock speed increase.

You'll get marginally higher bandwidth with 533MHz, but not enough to make a big impact.

Chaz

 

I guess my real question should be, "Has anybody seen a speed bump in GPU bound applications by switching to DDR2-533?"

My existing memory is DDR2-400 3-3-3-8

The best DDR2-533 I can find is OCZ at 4-4-4-8. That's a big latency jump and the CPU won't be able to take advantage of the extra bandwidth.

All of the DDR2-400 Mhz RAM I can find only lists the CAS latency. I can't find any other specs.

This is what I'm looking at right now:
Kingston KVR400D2S3
Gigaram gr2ds8b

Does anybody have specs on these? Googling doesn't produce anything other than CAS latency.

Thanks.