People seem generally unaware of the difference between number of channels, width of channels, and number of dimms. In fact this question is wrong, or at least

People seem generally unaware of the difference between number of channels, width of channels, and number of dimms. In fact this question is wrong, or at least misleading. The OP went from one DDR5 dimm (with two 32 bit channels) to 2 DDR5 dimms with a total of 4 32 bit channels. Thus doubled the bandwidth, but also doubled the number of memory quests you can have in flight. Given that GPUs in general are quite bandwidth intensive, not surprising that graphics performance significant increased. This is the main reason why the M1 pro -> M1 max doubles the memory bandwidth, it doubles the iGPU performance in many cases.