Radeon 4870 question

[rkasper]

on newegg there are Radeon 4870's with many different memory clock speeds.

for example the Asus has a clock of 3600mhz and the visiontek only has a 1800mhz clock. Then you have the MSI OC edition that has a 2000mhz clock and that is less then the Asus but somehow it is overclocked. I don't meen to be a noob but can someone explain this to me.

Asus 4870
Visiontek 4870
MSI OCed Edition

[EXreaction]

Memory clock rates are just able to be reported differently.

The first one is correct when it says 3600MHz (900MHz DDR5).

The memory is really clocked at 900 Mhz, but because it can put through 4x the data as SDR memory they call it 3600 Mhz "effective".

I am assuming that the last two are 900 Mhz and 1000 Mhz. Just that when they tried to make an "effective" speed they treated the memory like DDR where the effective speed is double the normal.