I think we're dealing with Socket 478 here, not P4 775 Daffy. ???Maybe??? Meaning that DaffyKantReed's suggestions on hard drives doesn't apply because I'm willing to bet the systems you are looking at require an IDE interface, not SATA like the one's he mentions.
Could well be Socket 478, but many of those boards had SATA capability using the Intel ICH5R. The Promise 20378 was common as a second SATA controller. This was Q1 2005. At the time there was no performance advantage between the SATA and ATA interface. The fastest 7200RPM hard drives could reach 66MB/sec sequential transfer rateshttp://www.storagere...50KLA360_8.html
Four years later sequential transfer rates have doubled.http://www.tomshardw...iar,2261-7.html
It's only in Q1 2009 when we've saturated the ATA100/133 bus with a 7200RPM HDD.
On FSB: when overclocking I would choose the lowest FSB available for a given clock speed, something like the E5300 at 2.6GHz stock, then choose to increase the multiplier, rather than raising the FSB. This resulted in a more stable OC than did a higher FSB and a lower multiplier. Synthetic benchmarks could be a little better (10%) in the case of the later.
Memory bandwidth was an important factor, especially with Intel processors, including the Core2Duo series. The general idea was to use the fastest DDR2 you could afford. The unlocked Athlon 64 X2 5000+ Black Edition and similar processors would run fine with PC2-6400 (DDR2 800). I will concede the Intel processors were generally faster at video encoding than any Athlon 64 X2, irrespective of over clocking.
Yesterday, I replaced the X25-M SSD in my laptop with the original Hitachi 2.5" HTS545016B9A300 5400RPM hard drive. No other hardware was changed, and a fresh and tweaked install of Windows 7 was performed.
The results would have made a pawn broker cry.
Reads of 215MB/sec were reduced to 43MB/sec, based on three runs with HD Tune 2.55. I did not test writes, but I suspect those would max out at about the same speed. It's like transferring a file to/from a USB stick compared to writing the same file on a fast hard drive.
I may install XP Pro on the laptop, rather than Windows 7 in the hopes it'll feel a little quicker.