RX 7700 XT Revisit – ft. Gigabyte, PowerColor & Sapphire
It's been a year, almost to the day, since we first reviewed AMD's RX 7700 XT. While it was clearly faster than its Nvidia rivals at the time, we couldn't quite understand the appeal of this GPU given it was priced so closely to the superior RX 7800 XT. It's time to revisit the RX 7700 XT however and see if anything has changed, with a bit of help from the Gigabyte Gaming OC, PowerColor Hellhound and Sapphire Pure models…
With prices dropping across the board, some RX 7700 XT models can now be found for as little as £340 at the time of writing, down from the £430 MSRP that we saw at launch. That's a hefty discount and could go some way to making these GPUs more appealing.
We already looked at the Sapphire Pulse in our day 1 review, and today we are including the Gigabyte Gaming OC, PowerColor Hellhound and Sapphire Pure cards to see what they can bring to the table.
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 quickly recap the specs. Unlike the smallest RDNA 3 GPU – the RX 7600 – AMD has made a return to its chiplet-based design for the RX 7700 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. One of those MCDs is disabled however, as the 7700 XT is not a full implementation of Navi 32.
Internally though, the compute makeup hasn't been radically changed. The cut-down Navi 32 silicon deployed here packs in 54 Compute Units, each of which houses 64 Stream Processors, for a total of 3456 shaders. There's also 54 Ray Accelerators – one per CU – and 96 ROPs.
As for clock speed, this remains high with the RX 7700 XT, with AMD touting a boost of up to 2544MHz, though a slightly lower game clock of 2171MHz. The Pulse we tested on day 1 is clocked at reference speeds, however the Gigabyte Gaming OC and PowerColor Hellhound tout a 2599MHz boost, while the Sapphire Pure is rated for 2584MHz.
Meanwhile, the memory configuration is almost identical to the previous generation RX 6700 XT. We still find 12GB GDDR6 operating over a 192-bit interface, but this time the memory clocks in at 18Gbps, up from 16Gbps. This gives a memory bandwidth of 432 GB/s, though AMD claims an ‘effective' bandwidth of 1995.3 GB/s due to the 64MB of 2nd Gen Infinity cache.
Power draw for the RX 7700 XT is rated at 245W 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.The post RX 7700 XT Revisit – ft. Gigabyte, PowerColor & Sapphire first appeared on KitGuru.
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