Friday, June 23rd 2023
Radeon RX 7800 XT Based on New ASIC with Navi 31 GCD on Navi 32 Package?
AMD Radeon RX 7800 XT will be a much-needed performance-segment addition to the company's Radeon RX 7000-series, which has a massive performance gap between the enthusiast-class RX 7900 series, and the mainstream RX 7600. A report by "Moore's Law is Dead" makes a sensational claim that it is based on a whole new ASIC that's neither the "Navi 31" powering the RX 7900 series, nor the "Navi 32" designed for lower performance tiers, but something in between. This GPU will be AMD's answer to the "AD103." Apparently, the GPU features the same exact 350 mm² graphics compute die (GCD) as the "Navi 31," but on a smaller package resembling that of the "Navi 32." This large GCD is surrounded by four MCDs (memory cache dies), which amount to a 256-bit wide GDDR6 memory interface, and 64 MB of 2nd Gen Infinity Cache memory.
The GCD physically features 96 RDNA3 compute units, but AMD's product managers now have the ability to give the RX 7800 XT a much higher CU count than that of the "Navi 32," while being lower than that of the RX 7900 XT (which is configured with 84). It's rumored that the smaller "Navi 32" GCD tops out at 60 CU (3,840 stream processors), so the new ASIC will enable the RX 7800 XT to have a CU count anywhere between 60 to 84. The resulting RX 7800 XT could have an ASIC with a lower manufacturing cost than that of a theoretical Navi 31 with two disabled MCDs (>60 mm² of wasted 6 nm dies), and even if it ends up performing within 10% of the RX 7900 XT (and matching the GeForce RTX 4070 Ti in the process), it would do so with better pricing headroom. The same ASIC could even power mobile RX 7900 series, where the smaller package and narrower memory bus will conserve precious PCB footprint.
Source:
Moore's Law is Dead (YouTube)
The GCD physically features 96 RDNA3 compute units, but AMD's product managers now have the ability to give the RX 7800 XT a much higher CU count than that of the "Navi 32," while being lower than that of the RX 7900 XT (which is configured with 84). It's rumored that the smaller "Navi 32" GCD tops out at 60 CU (3,840 stream processors), so the new ASIC will enable the RX 7800 XT to have a CU count anywhere between 60 to 84. The resulting RX 7800 XT could have an ASIC with a lower manufacturing cost than that of a theoretical Navi 31 with two disabled MCDs (>60 mm² of wasted 6 nm dies), and even if it ends up performing within 10% of the RX 7900 XT (and matching the GeForce RTX 4070 Ti in the process), it would do so with better pricing headroom. The same ASIC could even power mobile RX 7900 series, where the smaller package and narrower memory bus will conserve precious PCB footprint.
169 Comments on Radeon RX 7800 XT Based on New ASIC with Navi 31 GCD on Navi 32 Package?
Also, "answer to the AD103" is an interesting statement considering it's hoping for parity with 4070 Ti at best? 4070 Ti is AD104.So I guess that precludes you from ever commenting on 12VHPWR's woes because you never touched a 40 series card? We're all armchair generals here :D
Though I am curious what these clock "bugs" are, even when it comes to problems seems like Navi31 has more relevant concerns that need to be solved first.
Just random thoughts ...
Also 7600 should have been as fast as 6700, just as a generational rule where the x600 should be as fast or faster than previous x700 in both Nvidia's and AMD's case.
But the problem is not 7600 vs 6700. It's 7600 vs 6650 XT. Same specs, same performance, meaning RDNA2 to RDNA3 = minimal gains.
That's where people imagine that 7800XT. But I think we already have the 7900XT doing this. Its just too expensive. The price drops we saw in news yesterday are finally nudging it into the right place, but now there is no wow effect and local pricing will adjust too slowly for it to really make a dent.
AMD did a penny wise pound foolish launch imho.I'm sure 3 Ghz was a stretch goal for them or something, because I have actually seen my 7900XT go over 2900 on rare occasions. All it took was nudge the max frequency slider to the right. You won't have it reliably, but it will just situationally boost to it.
Unfortunately no heads will roll, Radeon needs new blood, innovative people to develop products and the brand. The boomers that developed these GPUs in the 2000s and linger in upper management need to go. They can't keep up with the industry anymore.
This is from the original review of TechPowerUp but I think it still remains a problem even today.Probably.In my opinion it is. Looking at 6650XT and 7600 specs side by side and then no performance change in games, that's a problem.
People parrot marketing and short term nonsense. Long term strategy is where its at.
Don't know what a GPU needs to do to keep feeding a high refresh rate monitor or a dual monitor setup. But close to 100W power consumption in video playback is unacceptable in 2023. While an opinion I also believe it is logical to say that. Your smartphone in your pocket or on your desk can probably playback the same video files at 5-10W power consumption. In fact even AMD's own APUs play video while keeping their power consumption for the whole SOC at even lower than 15W. So, something gone wrong with RDNA 3 here. And even if we consider this still an opinion, then there is this chart
where a 6900XT is at half the power consumption.
AMD Radeon RX 7900 XTX Review - Disrupting the RTX 4080 - Power Consumption | TechPowerUp