DDR2 vs GDDR3

GDDR3 較 DDR2 快!
前者bandwidth較寬, 但都只能在較高解像(e.g.1600x1200)畫面及色深(e.g.32bits)還要GPU(>GF6800)夠勁配合, 才明顯發揮所長!!

GDDR3 is now commonly used in most NVIDIA- or ATI-based video cards. However, further confusion has been added to the mix with the appearance of budget and mid-range graphics cards which claim to use "DDR2". These cards actually use standard DDR2 chips designed for use as main system memory. These chips cannot achieve the speeds that GDDR3 can but are fast and cheap enough to be used as memory on mid-range cards.
http://en.wikipedia.org/wiki/DDR2

DDR2

Module name Bus clock Chip type Peak transfer rate PC2-3200 200 MHz DDR2-400 3.200 GB/s PC2-4200 266 MHz DDR2-533 4.267 GB/s PC2-5300 333 MHz DDR2-667 5.333 GB/s1 PC2-6400 400 MHz DDR2-800 6.400 GB/sBandwidth is calculated by taking transfers per second and multiplying by eight. This is because DDR2 memory modules transfer data on a bus that is 64 data bits wide, and since a byte is comprised of 8 bits, this equates to 8 bytes of data per transfer.GDDR3, Graphics Double Data Rate 3, is a graphics card-specific memory technology, designed by ATI Technologies.
It has much the same technological base as DDR2, but the power and heat dispersal requirements have been reduced somewhat, allowing for higher-speed memory modules, and simplified cooling systems. This memory uses internal terminators, enabling it to better handle certain graphics demands. To improve bandwidth, GDDR3 memory transfers 4 bits of data per pin in 2 clock cycles.


GIGABYTE GA-965P-DS4 P965 M/B
是冇onboard display?
http://product.pcpop.com/000029711/Index.html