Why is my computer running slower than my brothers?

[xelis]

Ok, I just had a question for some of the experts out there that may be able to see why my computer is slower in loading games than my brothers. Please keep in mind these machines are running at stock speeds, but I am not sure why my load times are slower considering my components are all better other than the video card. Here are the specs.

Brother:
Intel Core 2 Quad Q6600 @ 2.4 Ghz - CPU
EP45-UD3P - Motherboard
Corsair PC2-6400 2x2GB DDR2 timings: 5-5-5-15
Nvidia Geforce 9800 GTX+ 512 MB
Maxtor DiamondMax 21 STM3500630AS 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" - Hard Drive

My Rig:
Intel I7-920
EX58A-UD3R
Corsair PC3-1600 DDR3 3x2GB timings 9-9-9-24
Radeon XFX 4770 512MB (however I am replacing this card in a week with the 5770)
Maxtor MaXLine Pro 500 7H500F0 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" -Hard Drive

Please let me know what is causing his machine to load into games faster. I cannot think of anything other than perhaps the video card, but I didn't think that would affect load times. Much appreciated.

 

[xelis]

O, And if you have time please rate my build. Wondering if there is anything I could get for cheaper or suggestions on what I should have. Thanks

From Microcenter:
I7-920 ~$169.99
X58A-UD3R ~209.99 +20 dollar mail in rebate
Corsair 2x3GB ~159.99 + 30 dollar mail in rebate
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Final Total = $616.88 (after tax) minus 50 = 566.88
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From Newegg:
600W OCZ PSU + Radeon 4770 512MB ~ $132.48(combo) +40 rebate

Total = 132.48 minus 40 rebate = 92.40
*Note I resold the 4770 for 80, and paid 60 extra for a XFX 5770. (159.99 - $20 BCB) = 139.99
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Final Total = 92.40 - 80 = 12.40 + 59.99 = $72.39
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Total Computer Cost = 639.36
I kept my harddrive and case from previous computer.
I do plan on CFing the 5770s in the future, just wondering if a 600W PSU can handle this with CF?
Thanks.