Quote:My memory is supposedly running at 2100 MHz (factory OC'd) but ill have to check on that. (1050 MHz each way if you want to be completely wrong).
Fixed that for you. Jesus christ I don't know where you got that idea from. You can't add clock rates together like that, it makes no sense.
A unidirectional bus running at 3GHz runs at 3GHz
A bidirectional bus with 3GHz signals running in both directions runs at 3GHz
A unidirectional bus with lots of parallel signals running at 3GHz in the same direction is still a 3GHz bus.
The number of wires and directions used do not affect the frequency of the signal.
Your 6750m has a 900MHz 128 bit wide bidirectional GDDR5 memory bus that runs at quad data rate (4 data transfers per clock cycle). This means that there are 3600 MT/s (megatransfers per second) or 3.6 GT/s over the bus with each transfer moving up to 128 bits (16 bytes) of data per transfer. 16 bytes per transfer x 3.6 GT/s = 57,600,000,000 B/s or 57.6 GB/s. It will be listed as 3600 MHz despite the fact that there is no signal anywhere in the bus that cycles faster than 900 MHz because these days manufacturers always list the data transfer rate instead of the clock rate but use Hz as if it were the clock rate (and if anybody points that out to them they just say that it's the "effective clock rate", another BS invented term used for product marketing).
1050MHz x 4 transfers per cycle = 4200 MT/s or 4200MHz "effective clock rate"
Quote:I believe it is x4 not x2
The correct terms are quad pumped and dual/double pumped or QDR (quad data rate) and DDR (double rate). x4 and x2 refer to bus width not transfer rate ratios.
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"I shall be a good politician, even if it kills me. Or if it kills anyone else for that matter. "
-Mark Antony