The fan in my son's card is going bad and trying to find a replacement fan. I removed it and its a T & T 4510M12F. I have located some 4510M12E and same with last letter being a S but no F. Don't know what the difference is on the last letter and I figure it possible a fan design but unsure. Anyone knows what fan will work or know what the last letters mean? The closest match by looking at pictures is the EVERCOOL VC-EC4510M12S-B VGA Cooling Fan. Thanks