February 1, 2023

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AMD’s Flagship RDNA3 GPU Rumored to Feature 384-bit Memory Bus

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As we head into summertime, extra facts about AMD’s forthcoming GPU architecture is finally coming to mild. So far there has not been a ton of details to peruse, in spite of there becoming a deluge of leaks about Nvidia’s ideas. To rectify this imbalance, internet sleuths have been poring around the company’s drivers seeking for any morsel of details they can locate. They a short while ago hit pay grime care of AMD’s linux motorists for GPUs. AMD has due to the fact patched the information out of the driver, whilst seemingly verifying it by accomplishing so.

A Twitter user named Kepler (ironically) was initial to spot the element. The driver experienced a line that was labeled MCD_Occasion_NUM with the quantity six. This seems to ensure six memory controllers. If you extrapolate that to every 1 becoming 64-little bit, that equals a 384-bit memory controller. This is an upgrade to the 256-little bit bus on its flagship RDNA2 GPUs, the RX 6900/6950 XT. What is intriguing is AMD place individuals GPUs up versus Nvidia’s RTX 3090, which has a 384-bit bus. AMD stated a wider bus was not needed, as it experienced a trick up its sleeve: Infinity Cache. Total, AMD was ideal. It was able to go toe-to-toe in rasterization with Nvidia this round. Regardless of reaching parity with its rival, it appears to be like AMD is not getting any probabilities with RDNA3. AMD also replaced this line of code with distinct text a 7 days later on, in accordance to Videocardz. As constantly, deleting the offending text just heightens the intrigue.

Twitter consumer AMDGPU’s mockup of the Navi 31 deal. (Image: @AMDGPU_)

This leak would seem to affirm the earlier speculation about the design of the chip as effectively. As proven higher than, it’s very long been rumored to be a seven-chiplet GPU. That signifies a primary graphics chiplet and 6 multi-cache dies, or MCDs. This could mean it will sport as substantially as 192MB of Infinity Cache assuming 32MB for every die. Kepler also predicts AMD could use 3D stacking on its flagship GPU, doubling that number to 384MB. If so that would mark a radical strengthen in the sum of Infinity Cache it is applying. The recent RX 6950 XT has just 128MB.

Also, utilizing the 6950 XT as a benchmark, we can also count on memory bandwidth to be virtually double for RDNA3. If it takes advantage of the similar 18Gb/s GDDR6 as the current GPU, it would be able of 864GB/s. That’s when compared to the 6950’s 576GB/s maximum. It also doesn’t get into account the added benefits of Infinity Cache both. That would simply enable an RDNA3 GPU to reach 1TB/s of memory bandwidth. This would match the memory bandwidth of Nvidia’s RTX 3090 Ti.

A person potential explanation for AMD’s bandwidth boost lies in the over-all measurement of the card. Top rated-stop RDNA3 playing cards have been rumored to area up to 12,288 cores. The leading-stop Radeon 6950XT fielded 128MB of L3 cache to again up 5,120 GPU cores. If AMD bumps main counts this superior, even a 192MB L3 cache may possibly not be ample. A 384MB L3 would essentially boost the full quantity of L3 relative to the selection of cores, when a 192MB L3 would nonetheless depict a modest decrease.

Exams of AMD’s memory bandwidth have continually proven that Infinity Cache does reduce force on memory bandwidth, so irrespective of how considerably cache AMD fields, a person factor is obvious: If these rumors are legitimate, the business determined it needed to use both of those memory bandwidth and Infinity Cache to catch up with Nvidia’s in general functionality fairly than substituting 1 for the other.

For its portion, Nvidia is also rumored to be raising the cache dimensions on its forthcoming Ada Lovelace GPUs. Past reviews indicated Nvidia would be bumping L2 quantities by 16x, at the very least on some designs. It’s speculated to be including 16MB of L2 for every 64-bit memory controller, for a total of 96MB. It presently works by using just 512KB of L2 on its GA102 die with 32-little bit memory controllers. This would mark a major improve in L2 quantities, as Nvidia tries to blunt AMD’s cache offensive.

As usually, we will have to wait around and see exactly where the chips drop when these two titanic GPUs go head-to-head later this year. What is specially fascinating this time about is each businesses are making use of the same TSMC N5 process. This will make for an unprecedented battle of MCM vs . monolithic designs working with the same fabrication node. One particular problem was introduced up recently however, which is that TSMC consumers were being on the lookout to decrease their existing orders. This has been in response to the the latest GPU dump that is occurred, as effectively as world wide financial jitters. However, that report stated AMD was not asking to lower its purchase of 5nm solutions, but Nvidia was. This could lead to a hold off for the RTX 40-sequence launch. TSMC reportedly instructed Nvidia it can not cut down its order, but it can thrust it back again a bit.

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