16 march i bought vga called evga gtx 960 (4g) i was very happy and brother bought zotac gtx 960 by chance i was comparing my vga with his one i discoverd that zotac has 200 mhz more than evga gaming but evga has best cooling i called the seller because he told me to buy evga onstead of zotac then he told me he is sorry and he can change evga for zotac (2gb) should i change it ?