I'm going strictly by my experiences as it pertains to audio signal processing, i.e. AudioMulch...
With my NF7-S board (which is considered a great socket A board), I was limited to how much VST plugins and at what sampling rate I was able to process my audio. Even with rather low CPU utilization (under 40%), I would get drop-outs, tempo shifts, static on the output stage...I was forced to lower my sampling rate.
On my new board (socket 939), with an equivilent CPU, but with the ATI chipset, I'm able to sample higher and utilize more and more sophisticated VST's, while maintaining a higher or equal CPU load, and play the audio smoothly and cleanly...
I think it has to do with memory management and bus thruput...i.e. the chipset.
I made improvements with the nForce 2 board with BIOS tweaks, but it was never as good as I'm getting now.
As far as my desktop PC is concerned, I was running an Asus 680i chipset with a Q6600 quad-core, overclocking of course, and it was VERY limited to as far I could go. It was also VERY picky with the RAM and
power supply...
Often times it wouldn't even POST with 'default' settings without having to remove a stick of RAM.
My new board, Asus P5Q, with Intel P45 chipset is a marvel! Simply outstanding...I'm able to run my 2.4Ghz quad at 3.56Ghz easily (1776Mhz FSB!!)...RAM at 1180Mhz, all with just minor voltage tweaks.
(Both quad boards ran liquid cooling as well)
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