Hi there adcdam,
Usually, a newer model of some product is considered to be better than an older one. Though, when it comes to gaming, only your loading times will be affected by the HDD. Furthermore, as this drive is 7200 RMP, you will not really experience any noticable performance difference between the two drives.
The fact that it is SATA 2 doesn't really matter as the drive's speed can't reach the limit of SATA 2.
So, as you have already bought this drive, I would advise you to just stay with it.
Let me know in case you have some more questions,
D_Know_WD
