Tuesday, October 25th 2022
AMD Radeon RX 7900 XTX to Lead the RDNA3 Pack?
AMD is reportedly bringing back the "XTX" brand extension to the main marketing names of its upcoming Radeon RX 7000-series SKUs. The company had, until now, reserved the "XTX" moniker for internal use, to denote SKUs that max out all hardware available on a given silicon. The RX 7000-series introduce the company's next-generation RDNA3 graphics architecture, and will see the company introduce its chiplets packaging design to the client-graphics space. The next-generation "Navi 31" GPU will likely be the first of its kind: while multi-chip module (MCM) GPUs aren't new, this would be the first time that multiple logic chips would sit on a single package for client GPUs. AMD has plenty of experience with MCM GPUs, but those have been single logic chips surrounded by memory stacks. "Navi 31" uses multiple logic chips on a package; which is then wired to conventional discrete GDDR6 memory devices like any other client GPU.
The rumored Radeon RX 7900 XTX is features 12,288 stream processors, likely across two logic tiles that contain the SIMD components. These tiles are [for now] rumored to be built on the TSMC N5 (5 nm EUV) foundry process. The Display CoreNext (DCN), and Video CoreNext (VCN) components, as well as the GDDR6 memory controllers, will be built on separate chiplets that are likely built on TSMC N6 (6 nm). The "Navi 31" has a 384-bit wide memory interface. This is 384-bit and not "2x 192-bit," because the logic tiles don't have memory interfaces of their own, but rely on memory controller tiles shared between the two logic tiles, much in the same as a dual-channel DDR4 memory interface being shared between the two 8-core CPU chiplets on a Ryzen 5950X processor.
The RX 7900 XTX features 24 GB of GDDR6 memory across a 384-bit wide memory interface. This memory ticks at 20 Gbps speed, which means a raw memory bandwidth of 960 GB/s. AMD is also expected to deploy large on-die caches, which it calls the Infinity Cache, to further lubricate the GPU's memory sub-system. The most interesting aspect of this rumor is the card's typical board power value, of 420 W. Technically, this is in the same league as the 450 W typical graphics power value of the GeForce RTX 4090. Since its teaser earlier this year in the launch event of the Ryzen 7000 series desktop processors, speculation is rife that AMD will not deploy the 12+4 pin ATX 12VHPWR power connector with its Radeon RX 7000-series GPUs, and the reference-design board likely has up to three conventional 8-pin PCIe power connectors. You're any way having to spare four 8-pin connectors for an RTX 4090.
AMD's second-best SKU based on the "Navi 31" is expected to be the RX 7900 XT, with fewer stream processors—likely 10,752. The memory size is reduced to 20 GB, and the memory interface narrowed to 320-bit, which at 20 Gbps memory speed produces 800 GB/s of bandwidth. Keeping up with the trend of AMD's second-largest GPU having half the stream processors of the largest one (eg: "Navi 22" having 2,560 against the 5,120 of the "Navi 21,") the "Navi 32" chip will likely have one of these 6,144-SP logic tiles, and a narrower memory interface.
Source:
VideoCardz
The rumored Radeon RX 7900 XTX is features 12,288 stream processors, likely across two logic tiles that contain the SIMD components. These tiles are [for now] rumored to be built on the TSMC N5 (5 nm EUV) foundry process. The Display CoreNext (DCN), and Video CoreNext (VCN) components, as well as the GDDR6 memory controllers, will be built on separate chiplets that are likely built on TSMC N6 (6 nm). The "Navi 31" has a 384-bit wide memory interface. This is 384-bit and not "2x 192-bit," because the logic tiles don't have memory interfaces of their own, but rely on memory controller tiles shared between the two logic tiles, much in the same as a dual-channel DDR4 memory interface being shared between the two 8-core CPU chiplets on a Ryzen 5950X processor.
AMD's second-best SKU based on the "Navi 31" is expected to be the RX 7900 XT, with fewer stream processors—likely 10,752. The memory size is reduced to 20 GB, and the memory interface narrowed to 320-bit, which at 20 Gbps memory speed produces 800 GB/s of bandwidth. Keeping up with the trend of AMD's second-largest GPU having half the stream processors of the largest one (eg: "Navi 22" having 2,560 against the 5,120 of the "Navi 21,") the "Navi 32" chip will likely have one of these 6,144-SP logic tiles, and a narrower memory interface.
95 Comments on AMD Radeon RX 7900 XTX to Lead the RDNA3 Pack?
Nostalgia is real if they go for the name.
If i was going to buy a card for CAD or video editing, i'd snap up a 3080/90/TI in a heartbeat. But i don't think anyone should be that impressed by what Nvidia, or intel for that matter is having to do to cling to their crowns. The planet is dying, and Nvidia is there trying to normalize 600w for a video card so they can market themselves as the leader in 8k gaming performance. Intel is once again pushing CPU power consumption, up to 350w this time so they can claim a 10% performance increase (sometimes) and all they had to do was DOUBLE the power draw. This isn't the direction that things are supposed to be moving in.
That's what I would like to see back the most from that moniker, being top of the line in your generation without requiring me to choose between being able to stay relatively well fed or game at the highest possible settings available at the time.
heh, we will see soon enough.
More materially to my point, the 6900XT enjoyed advantages in the metrics I quoted to the tune of 88% and 61%, I don't think it enjoys a single win over the 3090 to the tune of even 61%, let alone 88%, but I'm sure if you dig hard enough you might find an unrealistic niche example or two where that might be the case.
From what I know, the 6900XT enjoyed a minor lead at 1080p (less than 10% on average), roughly par at 1440p, and the 3090 enjoyed a minor lead at 4k (less than 10% on average)That's the reality I remember, expect most publications don't really test DLSS, at least not in like for like testing, because then it wouldn't be like for like... so the 3090 trounces a 6900XT for RT, and then you have DLSS to help even more.If I were you I'd brace for AMD being all too happy to follow this trend, hell, it's already started.
The 12VPWR connector is unnecessary, frankly. 8 pins are larger and clunky, but they work well, and have for 15 years.Well that card would be $662 today. Oh, and dont forget the core 2 at the time was a pricy bunch, a lower end core 2 was over $300, or $441 today.
$600 still buys you a whole lotta GPU today.
WHY this undersized 12pin connector was even created with smaller pins, when existing 8pin PCI power connectors are capable of passing 300W/25A per cponnector. Corsair clearly demonstarted this with thier 2x 8pin to 12pin cables - www.corsair.com/uk/en/Categories/Products/Accessories-%7C-Parts/PC-Components/Power-Supplies/600W-PCIe-5-0-12VHPWR-Type-4-PSU-Power-Cable/p/CP-8920284But as Jay pointed out the end user bent the cable wrong, but clearly Jay's comment was in jest. As this is just as bad as Steve Jobsworth telloing a custoemr they were holding the iphone 4 wrong...
I have always bent my cables for airs and tidyness, so depending on which card I upgrade too I think I will be buying a right angle adapter from Der8auer/Thermal Grizzly.
Superior i the sense that they can match or beat competitor, while spending less.
If yes, I'd expect CPU like offensive.