Need help on which computer i should buy i give the specs too please

[Mixer85]

Please read the specs of each computer and use your knowledge of which computer is better or make any suggestions on what i should change like the video cards or any other option on the computer everyones help would be greatly appreciated.I was thinking the amd computer but all info and know how would be great. Once again thank you very much to all who participated.
This the first system 1)
AMD Athlon 64 x2 4800+ (Dual Core) 64 Bit Socket 939 1024K Cache
Cooler Master Aquagate R80 Liquid cooling system
ASUS A8N-SLI Deluxe nForce4, PCI-EX SLI, DDR 400,SATA, 1GB LAN, iEEE
3GB PC 3200 DDR400 (3x1GB) Dual Channel
When choosing video card please refer to board's specifications for compatibility. Check more info
SLI Dual GeForce 7900GTX 512Mb DDR PCI Express 16X ( 2 cards)
200.0GB Western Digital 7200RPM SERIAL ATA UDMA 150 8m cache
Hard Drive Dual Cooling Fan Internal
200.0GB Western Digital 7200RPM SERIAL ATA UDMA 150 8m cache
Hard Drive Dual Cooling Fan Internal
Samsung 16X DVD-ROM Drive (black)
Samsung 16x52x24x52 DVD/CDRW Combo Drive (black or white)
Sound Blaster Audigy-2 ZS 7.1
WIRELESS 802.11 G PCI NETWORK CARD
USB 2.0 Adapter Card 4 port PCI
Thermaltake Tsunami VA3000DBA black 600W, side window,front USB & IEEE
Case Exhaust fan/Video card cooling fan

This is the second computer
Intel Pentium 4 670 3.8GHz, (800 FSB) 2048K Socket 775
Cooler Master Aquagate R80 Liquid cooling system
Gigabyte 8N-SLI Quad Royal nForce4 (dual core),SLI PCI Ex,DDR2,S-ATA,1GB LAN
When choosing memory please refer to board's specifications for compatibility. Check more info
3GB (3x1GB) PC4200 DDR2 533 Dual Channel
When choosing video card please refer to board's specifications for compatibility. Check more info
SLI Dual GeForce 7900GTX 512Mb DDR PCI Express 16X ( 2 cards)
200.0GB Western Digital 7200RPM SERIAL ATA UDMA 150 8m cache
Hard Drive Dual Cooling Fan Internal
200.0GB Western Digital 7200RPM SERIAL ATA UDMA 150 8m cache
Hard Drive Dual Cooling Fan Internal
Samsung 16X DVD-ROM Drive (black)
Samsung 16x52x24x52 DVD/CDRW Combo Drive (black or white)
Sound Blaster Audigy-2 ZS 7.1
WIRELESS 802.11 G PCI NETWORK CARD
USB 2.0 Adapter Card 4 port PCI
Thermaltake Tsunami VA3000DBA black 600W, side window,front USB & IEEE
Case Exhaust fan/Video card cooling fan

 

[Nukey]

For a start, it would be great to know what you will be using your computer mainly for. Personally, I would go for the AMD one. Straight away. But if you let us know what you will be mainly using it for then we could look into it a bit more for you.

 

[Didou]

It's not a good idea to have an uneven amount of memory modules with these systems.

 

[Mixer85]

I will be using this computer for Gamining... i should use 2 memory strips in stead of the three?

 

[vnf4ultra]

I would get the first one, but only get 2 1gb sticks.
Some benchmarks.
http://www23.tomshardware.com/cpu.html?modelx=33&model1=233&chart=68&model2=207
http://www23.tomshardware.com/cpu.html?modelx=33&model1=233&chart=69&model2=207
http://www23.tomshardware.com/cpu.html?modelx=33&model1=233&chart=61&model2=207