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New rumors about GeForce RTX 4090 and 4080 – pin layout, memory configuration, voltage source and cooling

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Igor on his site Igor’Slab shared his opinion that the upcoming flagship RTX 3090 Ti with a fat GPU GA102 Ampere is a test run for the next generation series. The reasons behind these conclusions were simple, the RTX 3090 Ti will be the first NVIDIA card with a PCIe Gen5 power connector and the first single GPU GeForce to reach 450W.

However, it has now emerged that the GA102 and AD102 GPUs can be pin-compatible, meaning that a large number of custom RTX 3090 Ti designs could be reused for next-gen flagships – RTX 4080 or maybe even RTX 4090. If so, it will save a lot of development effort and cost for board partners.

Suggested PCB design for AD102 GPU graphics cards, Source: Igor'Slab
Suggested PCB design for AD102 GPU graphics cards, Source: Igor’Slab

According to the report, the unnamed AD102 GPU reference board will feature 24 voltage converters for VRMS (rms signal voltage) and 4 for memory (total 28 phases). That’s up from 20 on the RTX 3090.

Please note that this is a reference PCB and not a custom variant from a board partner. Because it is compatible with GA102 GPUs and AD102 GPUs are not yet available, board partners are currently using it with a custom GA102 600W BIOS for internal testing before NVIDIA ships Ada GPUs to them. However, the board is ready and finalized, says Igor.

He noted that in order to live up to the rumored 600W TDP and support for up to 24GB of GDDR6X memory for the AD102 GPU, board partners will need to plug in 4x8pin to 12VHPWR (12+4) adapters, as shown yesterday with the RTX 3090. Ti with 450W which comes with a 3×8 pin adapter.

NVIDIA RTX 3090 had two PCB designs – PG136 for Founders Edition and PG132 Reference Board. RTX 3080 uses PG133 or PG132. Meanwhile, the upcoming RTX 3090 Ti is said to have PG139, but it’s not clear if that board number is for in-house production release or for handing over to custom card manufacturing partners.

NVIDIA RTX 3090 PCB types, source: VideoCardz
NVIDIA RTX 3090 PCB types, source: VideoCardz

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