Better Computer, Miniscule Difference

[Veta]

Hello all,

Alright, so recently I purchased a new Asus Essentio computer to upgrade from my five year old HP Pavilion Slimline computer. I fired it up, and downloaded PS2 (one of the big reasons I purchased it was to get better PS2 performance). But, upon entering the game I found that there really wasn't any improvement. Before, I was cpu bound, and ranging from 30-15 in the warpgate; 10-1 in battles. Now I am cpu and gpu bound ranging from 30-15 in the warpgate; 15-9 in battles.

The new computer's specifications:
Quad-Core Intel i5-3350P @3.10GHz
AMD Radeon 7470
6.00 GB stock RAM
Windows 8 64bit

Older computer's specifications:
Dual-Core Intel Pentium E5300 Wolfdale 2.6GHz
AMD Radeon 6670
4.00 GB stock RAM
Windows 7 64bit

I didn't expect to be able to run the game on Ultra at 60 frames after only paying $600, but I did expect to at least run on medium-low with a solid 30 fps.

Any advice is much appreciated,

Thank you.