confused?????????

i have a nvidia 7600gs and i am using rivatuner to overclock it. the really weird thing is that rivatuner is telling me that the stock ram speed is 266mhz and the highest possible overclcok on the ram is 400mhz??? what the hell this website http://www.firingsquad.com/hardware/geforce_7600_gs_preview/page2.asp
tells me that the stock speed of this card is 400mhz but when i have tried overclocking up to that i carnt get anywhere near. can someone explain to me why rivatuner thinks my stock ram speed is 266mhz because it has me completally stumped.

thanks in advance
 
The memory is DDR-Dual Data rate. If it is 200/400mhz most programs will show it as 200mhz. If it showing as 266 in rivatuner it either has 266/532 clocked memory stock instead of what you thought was 200/400 or its already overclocked by 66mhz.
 
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