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GPU-Z 0.4.5 wrong info?

Aug 28, 2010
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I have an Acer Aspire 4553G with an ATI Mobility Radeon 5470 512mb VRAM and the memory type detected in gpuz is DDR2. I checked the specifications in the ATI website and it states there that it only supports GDDR5 or DDR3 type of memory. I checked the video info in ATI Catalyst and it is indicated there as DDR3. So I would like to ask if the info provided by GPUZ is wrong/bug or my laptop is running only at limited vram speed/bandwidth? Thanks