Hi. You can save money if you don't mind going with other brands. The HD 7850 2GB is around $175 after rebate while the HD 7870 is around $195 after rebate. Also the GTX 660 can be had for around the same price as the HD 7870 if you prefer. An overclocked HD 7850 can get near the level of a stock HD 7870. Your system can handle either card. Whether the $20 difference is worth it is up to you. Check reviews sites for more information to guide your decision.