We’re all looking forward to NVIDIA’s next-generation Ada Lovelace GPU architecture and the upcoming GeForce RTX 40 series graphics cards … but before that, we have something interesting.
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NVIDIA’s second fastest Ampere GeForce RTX 3090 graphics card has a custom BIOS installed to see how it would work with less memory and on a slower memory bus. The NVIDIA GeForce RTX 3090 has 24GB of GDDR6X which was reduced to 20GB and 12GB in different tests, as well as its memory bus dropped.
For the 20 GB test, PRO Hi-Tech was reduced to a 320-bit memory bus, while for the 12 GB test the memory bus was reduced to 192 bits. This reduced the memory bandwidth of the usual 936 GB / s from NVIDIA on the GeForce RTX 3090 to 780 GB / s with 20 GB + 320 bit memory bus and only 468 GB / s with memory bus 12 GB + 192 bits.
The modder tested the 3DMark TimeSpy and 3DMark Port Royal benchmarks as well as some games. NVIDIA’s GeForce RTX 3090 with pure stock configurations with its 24GB of unadjusted GDDR6X memory reaches 18388 points on the graphics score, while the 20GB model + 320-bit memory bus drops to 17686 points , while the 12 GB + 192-bit memory bus reaches 17686 points. 13996 points: a large drop of approximately 24% of its normal performance.
It should come as no surprise that putting the ultra-fast, huge chunk of 24GB of GDDR6X memory on the 12GB + 192-bit GeForce RTX 3090 memory bus would greatly reduce performance, but … well … well. We are observing between 76% and 85% of the performance of the normal RTX 3090 with the memory bus BIOS of 12 GB + 192 bits, while most (95-96%) of the performance drops to 20 GB + 320. -Bit memory bus.