New details of NVIDIA’s GeForce RTX 4090 & RTX 4080 graphics cards have been revealed regarding the PCB and memory capacities.
According to information by MEGAsizeGPU, the NVIDIA GeForce RTX 4090 will come in one PCB flavor while the RTX 4080 will come in two flavors. The RTX 4090 will be using the same PCB for reference and AIC designs which will be equipped with up to 24 GB of GDDR6X memory and 14 layers for the PCB in total. The NVIDIA GeForce RTX 4080 has already leaked out which you can read more about here.
4080 12G GD6X 10layer PCB aic reference design
4080 16G GD6X 12layer PCB aic
reference design
4090 24G GD6X 14layer PCB aic reference design
note：4080 12G has a completely different pcb design from 4080 16G
— MEGAsizeGPU (@Zed__Wang) September 5, 2022
The NVIDIA GeForce RTX 4080, on the other hand, is reportedly going to have two entirely different PCB designs. The first one is said to feature up to 16 GB GDDR6X memory capacities and a 12-layer design for AIC cards while the second model is going to feature 12 GB GDDR6X memory support & a 10-layer PCB design for both AIC and reference models.
Now we have been hearing reports of 16 GB memory being the official model and nothing about a 12 GB variant but NVIDIA did have two RTX 3080 models, one with 10 GB and the other with 12 GB, launched previously. The RTX 3080 12 GB features a 384-bit bus while the RTX 3080 featured a 320-bit bus.
Since the RTX 4080 is rumored to feature a 256-bit bus for the 16 GB variant, the 12 GB AIC model will feature a cut-down 192-bit bus interface which is a significant reduction and surprisingly low bus width for a flagship graphics card. NVIDIA will have to compensate for the GPU bandwidth by upping the memory clocks and introducing a new memory compression technology to make up for its lost bandwidth. Maybe that’s why the RTX 4080 was recently rumored to have received a 23 Gbps GDDR6X memory bump.
It would be no surprise to us if the 16/12 GB models could be nothing more than engineering samples as we have seen 16 GB and 20 GB RTX 3080 models in the wild. These graphics cards were indeed made and produced by NVIDIA but were not feasible for a retail launch.
NVIDIA GeForce RTX 4080 ‘Expected’ Specifications
The NVIDIA GeForce RTX 4080 is expected to utilize a cut-down AD103-300 GPU configuration with 9,728 cores or 76 SMs enabled of the total 84 units whereas the previous configuration offered 80 SMs or 10,240 cores. While the full GPU comes packed with 64 MB of L2 cache and up to 224 ROPs, the RTX 4080 might end up with 48 MB of L2 cache and lower ROPs too due to its cut-down design. The card is expected to be based on the PG136/139-SKU360 PCB.
As for memory specs, the GeForce RTX 4080 is expected to rock 16 GB GDDR6X capacities that are said to be adjusted at 23 Gbps speeds across a 256-bit bus interface. This will provide up to 736 GB/s of bandwidth. This is still a tad bit slower than the 760 GB/s bandwidth offered by the RTX 3080 since it comes with a 320-bit interface but a lowly 10 GB capacity. To compensate for the lower bandwidth, NVIDIA could be integrating a next-gen memory compression suite to make up for the 256-bit interface.
For power, the TBP is now set to be rated at 340W, a 20W increase from the previous 320W spec that we got. This brings the TBP to the same ballpark as the existing RTX 3080 graphics card (up to 350W). Now it is not known whether the other RTX 40 series graphics cards will also be getting the faster GDDR6X memory treatment but we know that Micron has commenced full mass production of up to 24 Gbps GDDR6X memory modules so they have to go somewhere.
NVIDIA GeForce RTX 4090 ‘Expected’ Specifications
The NVIDIA GeForce RTX 4090 will use 128 SMs of the 144 SMs for a total of 16,384 CUDA cores. The GPU will come packed with 96 MB of L2 cache and a total of 384 ROPs which is simply insane. The clock speeds are not confirmed yet but considering that the TSMC 4N process is being used, we are expecting clocks between the 2.0-3.0 GHz range.
As for memory specs, the GeForce RTX 4090 is expected to rock 24 GB GDDR6X capacities that will be clocked at 21 Gbps speeds across a 384-bit bus interface. This will provide up to 1 TB/s of bandwidth. This is the same bandwidth as the existing RTX 3090 Ti graphics card and as far as the power consumption is concerned, the TBP is said to be rated at 450W which means that TGP may end up lower than that. The card will be powered by a single 16-pin connector which delivers up to 600W of power. It is likely that we may get 500W+ custom designs as we saw with the RTX 3090 Ti.
As for its feature set, the NVIDIA GeForce RTX 4090 and RTX 4080 graphics cards will rock all the modern NV feature sets such as the latest 4th Gen Tensor Cores, 3rd gen RT cores, the latest NVENC Encoder, and NVCDEC Decoder, and support for the latest APIs. They will pack all the modern RTX features such as DLSS, Reflex, Broadcast, Resizable-BAR, Freestyle, Ansel, Highlights, Shadowplay, and G-SYNC support too.
The NVIDIA GeForce RTX 4080 and RTX 4070 graphics cards will be amongst the first graphics cards besides the RTX 4090 to launch to gamers however we can’t tell whether the green team plans to launch them within this year soon after RTX 4090 or wait till early next year. The RTX 4090 is so far expected to launch around October 2022.
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