AMD RX 7800 XT Review

1. Introduction2. Meet the RX 7800 XT Reference Card3. Testing Methodology4. 3DMark Fire Strike & Time Spy5. 3DMark DirectX Raytracing6. Assassin's Creed Valhalla7. Cyberpunk 20778. Forza Horizon 59. God of War10. Horizon Zero Dawn11. The Last of Us Part 112. A Plague Tale: Requiem13. Ratchet and Clank: Rift Apart14. Red Dead Redemption 215. Resident Evil 416. Returnal17. Total War: Warhammer III18. Performance Summary (12-Game Average)19. Cost Per Frame Analysis20. Bonus Benchmark: Starfield21. Ray Tracing: Control22. Ray Tracing: Cyberpunk 207723. Ray Tracing: Cyberpunk 2077 RT Overdrive24. Ray Tracing: F1 2325. Ray Tracing: Hitman 326. Ray Tracing: Ratchet and Clank: Rift Apart27. Ray Tracing: Returnal28. Ray Tracing: Shadow of the Tomb Raider29. Ray Tracing Performance Summary30. Clock Speed31. GPU Temperatures32. Acoustics33. Power Draw: 1080p34. Power Draw: 1440p35. Power Draw: 2160p (4K)36. Performance per Watt: 1080p37. Performance per Watt: 1440p38. Performance per Watt: 2160p (4K)39. Total System Power Draw40. Closing Thoughts41. View All Pages

Hot on the heels of their announcement at Gamescom 2023, today marks the release of AMD's new mid-range GPUs, the RX 7700 XT and the RX 7800 XT. This review will focus on the latter model, though we do have a separate analysis of the RX 7700 XT if you want to read that. Built on new Navi 32 chiplet-based silicon, this graphics card hits the market at £479.99, and AMD claims it is faster than Nvidia's RTX 4070. We put it to the test over twelve games, plus another eight tested with ray tracing, to find out exactly how it performs… and yes, we did benchmark Starfield!

As with any new GPU launch, there is plenty to discuss today and we will cover as much as we can in this written article and in the video review embedded above. I do feel it is important to manage expectations for the RX 7800 XT, as I don't necessarily agree with the naming scheme. On paper, it sounds like the successor to the RX 6800 XT that launched back in November 2020, but the reality is the two products are positioned quite differently.

For one, the RX 7800 XT is launching at an MSRP of £479.99, £120 lower than the £599.99 launch price of the 6800 XT. The new GPU is also built on AMD's mid-range Navi 32 silicon and sits three models below the flagship 7900 XTX, whereas the 6800 XT used the biggest Navi 21 die and was positioned a single tier below the RX 6900 XT at launch. In actuality, the pricing and position of this RDNA 3 card would put it somewhere between the RX 6700 XT and RX 6800 – but let's see how things shake out in our benchmarks…

If you want to read this review as a single page, click HERE.

 

	RX 7900 XT	RX 7800 XT	RX 7700 XT	RX 6800 XT	RX 6800	RX 6700 XT
Architecture	RDNA 3	RDNA 3	RDNA 3	RDNA 2	RDNA 2	RDNA 2
Manufacturing Process	5nm GCD + 6nm MCD	5nm GCD + 6nm MCD	5nm GCD + 6nm MCD	7nm	7nm	7nm
Transistor Count	57.7 billion	28.1 billion	28.1 billion	26.8 billion	26.8 billion	17.2 billion
Die Size	300 mm² GCD 220 mm² MCD	200 mm² GCD 150 mm² MCD	200 mm² GCD 150 mm² MCD	519 mm²	519 mm²	336 mm²
Compute Units	84	60	54	72	60	40
Ray Accelerators	84	60	54	72	60	40
Stream Processors	5376	3840	3456	4608	3840	2560
Game GPU Clock	Up to 2000 MHz	2124 MHz	2171 MHz	Up to 2015MHz	Up to 1815MHz	Up to 2424MHz
Boost GPU Clock	Up to 2400 MHz	Up to 2430 MHz	Up to 2544 MHz	Up to 2250MHz	Up to 2105MHz	Up to 2581MHz
ROPs	192	96	96	128	96	64
AMD Infinity Cache	80MB	64MB	48MB	128MB	128MB	96MB
Memory	20GB GDDR6 20Gbps	16GB GDDR6 19.5 Gbps	12GB GDDR6 18Gbps	16GB GDDR6 16Gbps	16GB GDDR6 16Gbps	12GB GDDR6 16Gbps
Memory Bandwidth	800 GB/s	624 GB/s	432 GB/s	512 GB/s	512 GB/s	384 GB/s
Memory Interface	320-bit	256-bit	192-bit	256-bit	256-bit	192-bit
Board Power	315W	263W	245W	300W	250W	230W

First, let's take a quick look at the specs. Unlike the most recent RDNA 3 GPU – the RX 7600 – AMD has made a return to its chiplet-based design for the RX 7800 XT, as we initially saw last year with the RX 7900 XTX and 7900 XT. This time around, the 7800 XT offers a 200mm² Graphics Compute Die (GCD) using TSMC's 5nm process, flanked by four 150 mm² Memory Compute Dies (MCDs) built on TSMC's 6nm node.

Internally though, the compute makeup hasn't been radically changed. Navi 32 packs in 60 Compute Units, each of which houses 64 Stream Processors, for a total of 3840 shaders. There are also 60 Ray Accelerators – one per CU – and 96 ROPs.

As for clock speed, this remains high with the RX 7800 XT, with AMD touting a boost of up to 2430MHz, though a slightly lower game clock of 2124MHz.

Meanwhile, the memory configuration is almost identical to the previous generation RX 6800 XT. We still find 16GB GDDR6 operating over a 256-bit interface, but this time the memory clocks in at 19.5Gbps, up from 16Gbps. This gives a memory bandwidth of 624 GB/s, though AMD claims an ‘effective' bandwidth of 2708.4 GB/s due to the 64MB of 2nd Gen Infinity cache.

Power draw for the RX 7800 XT is rated at 263W Total Board Power (TBP), though AMD pointed out to us that this is an ‘up to' figure. We are using our well-established GPU power testing methodology in this review, so read on for our most detailed power and efficiency testing yet.

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