On 13th of February , AMD launched its HD 7000 series of cards - or HD 7770 and HD 7750 to be more precise. We're talking about graphics cards with next generation chips with the so called GCM Graphics Core Next architecture, which promise to deliver improved performance at a lower power cost. Our today's guest is XFX's DD Radeon 7750 800M 1GB (FX-775A-ZDFC) graphics card that's special for its special dual fan design. As you'd suggest, the DD in the name stands for Double Dissipation cooler design. The DD Radeon 7750 800M 1GB runs at reference clocks , i.e. 800MHz for the GPU and 1125MHz for the memory (4500MHz GDDR5).
AMD showed the reference design of its HD 7750s but all the cards we've seen thus far at least got their cooling changed. However, we must commend XFX on strapping its Radeon 7750 with DD cooling. We know that the DD cooler is effective and quiet, since we had it on our Black Super OC DD Radeon 7770 1120M 1GB graphics card that runs at 1120MHz. We're quite sure that the same cooler will have no trouble cooling the Cape Verde Pro GPU on our HD 7750. Note that this GPU is clocked slower than the Cape Verde XT, and we hope that the cooling won't be a limiting factor when it comes to additional overclocking.
The HD 7700 series belongs to Southern Island family, which is the first GPU family with GPUs made in 28 nanometer silicon fabrication processes, first to use PCI Express 3.0 x16 bus, and first with DirectX 11.1 support.
Cards from the HD 7700 series run on Cape Verde GPU, which is related to the HD 7900 series' GPU called Tahiti. However, Cape Verde is a smaller chip will less capabilities. Compared to the Tahiti's 1792 cores, Cape Verde XT (HD 7770) has only 640 while the PRO version of the chip (HD 7750) comes with 512 cores.
HD 7770 cards have 40 texture units and 16 ROPs. The 1GB of GDDR5 memory runs on 128-bit memory interface. HD 7750 cards have 32 texture units but the number of ROPs and the memory interface are identical to the HD 7770. According to the specs, HD 7770 cards have a TDP of 80W while HD 7750's TDP is 55w. Note that the HD 7750 comes without an external power connector.
XFX’s DD Radeon 7750 runs at reference clocks, as the GPUz screenshot below confirms.