GeForce RTX 4080/4090 series supports up to 24 GB of video memory

The GeForce RTX 3090 Ti is coming, and Nvidia has done a lot of testing for this card in the past. It uses a full GA102 core, as well as Micron’s new 2GB GDDR6X module, with a memory rate of 21 Gbps, and it is also the first graphics card with a TDP of 450W and a new 12+4Pin 12VHPWR power supply interface. There may be other reasons why Nvidia attaches so much importance to it.

According to Igor’s LAB, the GA102 may be pin-compatible with the next generation AD102 based on the Ada Lovelace architecture. This means that a lot of development work for the GeForce RTX 3090 Ti can now be carried over to the new generation of flagship products, including the GeForce RTX 4080/4090 series. If the news is true, this will save Nvidia’s partners a lot of development work and costs.

It is understood that the PCB reference design equipped with AD102 shows that the GPU power supply reaches 24 phases, and the memory power supply is 4 phases, a total of 28 phases. This is an increase over the GeForce RTX 3090’s 20-phase, which seems to confirm the rumors that the GeForce RTX 4090 series will consume 600W or more. Although the GA102 is pin-compatible with the AD102 since the AD102 has not yet arrived at this stage, Nvidia’s partners are rumored to use this PCB and custom GA102 600W BIOS for internal testing before receiving the Ada Lovelace GPU.
The picture shows that the PCB has 12 positions for placing video memory chips. If Micron’s 2GB GDDR6X module is used, the memory capacity can reach up to 24GB. It is said that the Founders Edition will continue to use an air-cooled radiator with a thickness of three slots. The non-public version may reach 3.5 slots, and there will also be products equipped with an integrated water cooling solution.

At present, there are two PCB reference designs for GeForce RTX 3090, one is PG136 for Founders Edition, which is a semi-custom special-shaped structure, the other is the more square PG132, while the GeForce RTX 3080 is PG133 or PG132. The GeForce RTX 3090 Ti is rumored to be using the PG139, but it’s unclear if there’s only one PCB reference design.