I believe the KO version is at 500mhz (as you stated) and it has a larger heatsink/fan?
I just called microcenter and they said it is the N624-FX. . N624 is the KO version (as opposed to the N620). Assuming that the FX (HDCP) is better than the AR i would say this is a better deal than Microcenter assuming you can "gamble" on a $80 rebate.
FYI ... eVGA step-up program: http://evga.com/stepup/default.asp?switch=2
I just called microcenter and they said it is the N624-FX. . N624 is the KO version (as opposed to the N620). Assuming that the FX (HDCP) is better than the AR i would say this is a better deal than Microcenter assuming you can "gamble" on a $80 rebate.
FYI ... eVGA step-up program: http://evga.com/stepup/default.asp?switch=2