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Re: All Graphics Cards related queries here.
I doubt 4670 can use 1GB memory.Better to go for 1 GB memory or greater as a standard for GPUs. Reason being down the line the user may upgrade to higher resolutions. Also via larger memory sets, the GPU has larger 'surface area' to load textures.
It runs at 2.5V, which enables them to run at higher clock rates, but also generate more heat. But the latest GDDR3/5s make do with 1.8V - 2V. Also some difference are
1. You can activate a memory bank and issue a read request in the same clock cycle. In DDR they are each lagged by 1 clock because there is a collision.
2. In GDDR you can write and read the same memory location at the same time. This isn't as useful anymore because GPU cache is much improved over the 'old days' and you 'shouldn't' have to read the same location you are writing.
3. GDDR has hardware reset facility, which quickly enables it to flush out all memory banks and start over.
nVidia has a 512BIT memory interface vs 256BT for ATI. But since ATI is using quicker memroy as the weopon of choice, DDR5 it evens the odds.