Hi sorry for late reply, first chance to get online today!
Simple short answer, yes this will be fine
More detailed answer,
The systems memory is DDR3 (perfect), And the Graphics memory will be DDR3/GDDR3 So this will perform fine! (If it 's the ddr3 varient, it will give maybee 2-5% less performance, nothing to worry about!)
Only week-point on this laptop is the Battery, but this is fine if you plug it in during intensive use. (you can alwayse buy another battery later on for backup power)
Treat the battery well by giving it a full charge ONLY when its empty! Also they dont like getting HOT... Something to keep in mind! (Use on a table when possible, or consider buy a quality cool-pad for when your gaming)
Try unplugging the battery when it's full and not needed. (on the mains adaptor)
I have kept my Dell Inspiron 8600's battery good as new since 2004 using these methods, still lasts 2-3 hrs
Feel free to ask anymore questions i will keep an eye on this thread.