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I wonder if a 7600 XT is a cut-down 7800 XT then, because both normal and XT variants of the 6700 and 7700 only have 12GB VRAM.

Nonetheless, great info. Sounds like it might be the budget inference king!

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Completely different chips; the VRAM differences are from how GDDR can be used, with either 1 or 2 chips on a single 32bit bus, the configuration with 2 chips is called clamshell. The 7800 XT and 7600 XT have same VRAM but the 7800 XT has a 256 bit memory bus while the 7600 XT has a 128 bit memory bus. Meanwhile the 7700 XT with 12 GB is on a 192 bit memory bus.

The workstation edition of GPUs usually do the clamshell configuration so they can easily double the VRAM and ramp up the price by a couple thousand

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