There are no architectural differences between GeForce 7800GTX 256MB and GeForce 7800GTX 512MB videocards. Both class of graphics card use identical Geforce 7800GTX GPUs, though the memory and GPU speeds have been modified.
What nVIDIA has done to differentiate the two cards is tweak the speed of the 512MB version GeForce 7800GTX core to 550 MHz.
The 3D operating frequency of the 215MB version Geforce 7800GTX is 430MHz, so there is a difference of 120MHz between the two. That variance will be most visible when high resolution gaming, with AA and AF enabled.
To keep up with the speed changes to the GPU, the memory frequency has been
increased from 1.2 GHz for the 256MB version GeForce 7800GTX, to a blistering
1.7 GHz on the 512MB version GeForce 7800GTX videocard. Nice. In situations
where Anti-Aliasing and Anisotropic Filtering are enabled, the faster memory
really can make a huge difference, and PCSTATS will explore this aspect a bit
later with our advanced benchmarks.
||Experts Tip: Videocard Temperature Monitoring|
While nVIDIA drivers have the capability of displaying the GPU core
temperature, the program thus far does not have the ability log this
information. Overclockers and enthusiasts are better served with RivaTuner
which is able to log 3D clock, memory speeds and core temperatures. This
data can come in handy for overclockers who are looking at different
means of squeezing out extra performance. To log temperatures you'll first
need to download a copy of RivaTuner (email colin for the link). With the
program loaded up, go to the 'Target Adapter' box and look for the
triangle pointing towards the bottom right hand corner. Click the triangle
to open up a few options then select the film/magnify glass option and
that will load up the software monitoring box. Next, dial in your
overclocking setting and run a 3D test. Sit back and watch
how the core temperature reacts to that game, and take it from
|Comments and Feedback? Suggest a Tweak.|
Okay, so we have faster core and memory speeds, and twice
the amount of on-videocard memory, but is this all really necessary to play the
latest video games? To be realistic, a videocard with 512MB of memory is a total
luxury. It's not a necessary feature to run the latest games by any stretch, but
it does help considerably when all the eye candy is cranked to the max. Got it?