Internal Laptop HDD vs External - Q bout performance

[toxikmuzik]

Ok so, I'm running Dolphin 4593 on the following system specs; (laptop)

Asus 50VT-X1
Intel Core 2 Duo P7450 oc'd @ 2.555Ghz
Geforce 9800M GS 512MB oc'd @ 610/960/1560
320GB HD @ 7200 RPM
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I have games stored on my internal drive, but I wanna shift them all to my external 1tb drive. It is a 1tb 7200rpm usb 2.0 drive. I'm wondering if I will suffer from any loss in performance, or if it will be the same, or better?

Thanks in advance,
- toxikmuzik