28 Power Phases, Single 16-Pin Connector & NVLINK Interface, Similar Design To RTX 3090 Ti Reference PCB

NVIDIA’s GeForce RTX 4090 graphics card’s reference PCB has allegedly been leaked and detailed by Igor’s Lab once again.

Leaked NVIDIA GeForce RTX 4090 Graphics Card PCB Shows A Design Reminiscent of The Existing RTX 3090 Ti PCB

Back in March, Igor Wallosek of Igor’s Lab posted what was then assumed to be a block diagram of the NVIDIA GeForce RTX 4090’s PCB. It was stated that the GeForce RTX 3090 Ti had been a crucial learning curve for NVIDIA and its AIB partners to ready themselves for the next-gen Ada Lovelace GPU lineup featured on the GeForce RTX 40 series.

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Now we have a much more detailed PCB diagram that should be used by the NVIDIA GeForce RTX 4090. The GeForce RTX 4090 will utilize the AD102 GPU, the flagship within the Ada Lovelace lineup. As per previous rumors, the Ampere GA102 and Ada Lovelace AD102 GPUs are likely to be pin-compatible which means they can be featured on similar PCB designs or ones with little modifications than to design completely brand new boards. This will allow AIBs to ease down the development process of their next-gen GeForce RTX 40 series custom models, helping them save production time & money.

NVIDIA GeForce RTX 4090 ‘Reference Model’ PCB:

NVIDIA GeForce RTX 3090 Ti ‘Founders Edition’ PCB:

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That might also explain why NVIDIA’s GeForce RTX 40 Founders Edition coolers, which leaked earlier, look so similar to existing GeForce RTX 30 series coolers. Besides some changes to the cooling plate and fin layout, the design almost looks identical. But with that said, the PCB here seems to be an AIB reference design rather than a Founders Edition PCB. The reason is that the PG139 SKU ‘Founders Edition PCB’ features a V-shaped design whereas the PG136 SKU comes in the standard rectangular shape.

Besides that, the PCB blueprint that Igor has churned up based on information from his sources shows that the AD102 GPU boards for the GeForce RTX 4090 and RTX 4080 are once again going to come in a compact layout. The layout shows a 28-phase power delivery of which 24 phases have been dedicated to the GPU & PLL while the remaining 4 phases power the memory. Currently, the RTX 3090 Ti Founders Edition features 21 phases, and both are reference designs. It is likely that the custom models could feature an even higher count if the next bit is true about the power limit.

Other than the power phases, there are 12 memory module traces on the front which would mean that the 24 GB capacity rumors are indeed correct and if NVIDIA wants to go higher, say 48 GB for a workstation variant, they can fill up the backside of the PCB with an additional twelve 2 GB modules (GDDR6/X). The NVIDIA GeForce RTX 4090 PCB features four display outputs which include a single HDMI and triple DisplayPort interfaces, and NVLINK connector, & a single 16-pin Gen 5 power plug. This means that we can expect up to 600W TDP on the AD102-powered cards. The RTX 4090 itself is said to be rated at around 450W while the RTX 4090 Ti can push things up to the 600W limit.

NVIDIA GeForce RTX 4090 Ti & RTX 4090 ‘Preliminary’ Specs:

Graphics Card Name NVIDIA GeForce RTX 4090 Ti NVIDIA GeForce RTX 4090 NVIDIA GeForce RTX 3090 Ti NVIDIA GeForce RTX 3090
GPU Name Ada Lovelace AD102-350? Ada Lovelace AD102-300? Ampere GA102-350 Ampere GA102-300
Process Node TSMC 4N TSMC 4N Samsung 8nm Samsung 8nm
Die Size ~600mm2 ~600mm2 628.4mm2 628.4mm2
Transistors TBD TBD 28 Billion 28 Billion
CUDA Cores 18432 16128 10752 10496
TMUs / ROPs TBD / 384 TBD / 384 336 / 112 328 / 112
Tensor / RT Cores TBD / TBD TBD / TBD 336 / 84 328 / 82
Base Clock TBD TBD 1560MHz 1400MHz
Boost Clock ~2800MHz ~2600MHz 1860MHz 1700MHz
FP32 Compute ~103 TFLOPs ~90 TFLOPs 40 TFLOPs 36 TFLOPs
Tensor-TOPs TBD TBD 320 TOPs 285
Memory Capacity 24 GB GDDR6X 24 GB GDDR6X 24 GB GDDR6X 24 GB GDDR6X
Memory Bus 384-bit 384-bit 384-bit 384-bit
Memory Speed 24.0 Gbps 21.0 Gbps 21.0 Gbps 19.5 Gbps
Bandwidth 1152 GB/s 1008 GB/s 1008 GB/s 936 Gbps
TGP 600W 450W 450W 350W
Price (MSRP/FE) $1999 US? $1499 US? $1999 US $1499 US
Launch (Availability) July 2022? July 2022? 29th March 2022 24th September 2020

NVIDIA GeForce RTX 4090 Graphics Card production timeline. (Image Credits: Igor’s Lab)

Igor has also posted a production/launch timeline of the upcoming NVIDIA GeForce RTX 40 series graphics cards, more specifically the AD102 powered RTX 4090. It looks like there are two rumors now with one stating an August launch while Igor states an August/September 2022. production time frame which would give us a launch around October 2022 at the earliest.