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In the second of our RX 7800 XT partner card reviews, today our attention turns to Gigabyte and the Gaming OC model. Boasting the most aggressive factory overclock we have seen so far, with a 2565MHz boost, the Gaming OC also features a hefty triple-fan cooler, dual-BIOS and a smattering of RGB lighting. Hitting the market at £529, let's see what this card can do.
We were highly impressed with the PowerColor RX 7800 XT Hellhound that we reviewed just a few days ago, but the Gigabyte RX 7800 XT Gaming OC looks like it could be a potential rival. It sports the highest out of the box clock speed of any Navi 32-based graphics card to pass through our doors, and it's not small either, with a large heatsink and triple-fan Windforce cooling setup. We look at thermal performance, noise levels, game benchmarks, overclocking and more in this review.
| 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 reference boost of up to 2430MHz. Gigabyte has increased this further, to 2565MHz, regardless of which BIOS is used.
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 Gigabyte has increased this for both BIOS. 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.
