AMD’s New Radeon RX 6500 XT Tested with PCIe 3.0 and the Results Aren’t Pretty


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This week AMD unveiled its first “budget friendly” RX 6000-series GPU with its RDNA2 technology, RX 6500 XT. The installation was not without controversy, however, for AMD to sell its $ 199 bid disrupted the Navi24 GPU to the point where it lacked the features that are considered essential for the modern GPU, even the entry-level model. For example, the card sends with only 4GB of VRAM, which the company said was a decision made to block crypto mining. The biggest impact of AMD’s idea of ​​sending the card is a PCI Express 4.0 (PCIe 4.0) version with only four PCIe routes to the CPU.

Now, the four-dimensional (x4) format itself is not bad, but since the card was designed to upgrade the old system based on its cost and overall functionality, it is possible for everyone to purchase a GPU. like the 6500 XT has an old PC. This means that this developer also has an old board, which probably has the PCI Express 3.0 interface, which it offers. half PCIe 4.0 bandwidth. Also, there have been many GPUs at these prices over the years with 16 PCIe routes, plus $ 149 (for starters, $ 400 at present) Nvidia GTX 1650. Sure, AMD has reduced the amount of PCIe on previous incoming cards, but not in this way. For example the Radeon RX 5500 XT similar to 2019 also had 4GB of VRAM, but it came with eight PCIe modes.

Images of Radeon RX 6500 XT. (Photo: PCMag.com)

All of this lays the groundwork for one major question to be answered: How will the RX 6500 XT perform on older PCIe 3.0 models? Fortunately, brave benchmarkers on Tom’s Hardware you answered this question by testing the new GPU on the old test bench, and the results are amazing. Although the results vary depending on the game being tested, which is normal, they were able to see a decrease in performance on some tests that ranged from 4 percent to 4 percent. 36 percent, which is very low. As a guide, he tested the new Radeon card next to Nvidia’s GTX 1650, which is a PCIe 3.0 card, but with 16 PCIe routes.

On a more advanced road, the transition from PCIe 4.0 to PCIe 3.0 will not have the same results. The x16 PCIe 4.0 cards do the same when tested on the PCIe 3.0 standard, and we can even expect the x8 card to show a slight decrease in migration. The problem here is that the x4 PCIe 3.0 connection is just the same as the x16 PCIe 1.0 connection and PCIe 1.0 was new 19 years ago. The demand for a single bandwidth for GPUs has grown steadily over the years, but they have to be great. The x4 PCIe 3.0 connection is not enough for the card to be fed, possibly due to a small VRAM device.

Test results show that if you run the RX 6500 XT on an older PCIe 3.0 system, it is much better than Medium high-performance configurations. However, when you upgrade to Ultra level, even at 1080p, the functionality can take on more responsibilities due to the one-click double VRAM feature and limited bandwidth. The two components work together to disrupt the GPU because, once the card buffer expires, the interface must be pulled on the PCIe bus. The card may work well in these cases regardless of the internal latency and low bandwidth X16 PCIe 4.0 connectivity, but the low capacity of the x4 PCIe 3.0 connectivity affects the card significantly.

Overall, in their seven-game series, the difference between PCIe 3.0 and 4.0 systems, at 1080p Ultra, was performing slower by 22.7 percent, compared to only eight frames at 1080p Medium. The GTX 1650 GPU, on the other hand, did the same on all PCIe models, thanks to its 16 PCIe specifications.

The worst case scenario for the Radeon RX 6500 XT was the Forza Horizon 5 and Borderlands 3 games. At Forza, at 1080p Ultra they only got 17.7fps using PCIe 3.0, and 28fps on PCIe 4.0, a 36 percent difference. At Borderlands the results were similar, as they achieved 23.9fps using PCIe 3.0, and 37.1fps using 4.0, 35.6 percent delta. However, such damage did not occur in all games, as Horizon Zero Dawn only provided a 4 percent difference in testing between the two connectors. So in the end, it doesn’t matter which game you like to play, and at the same time you would be wise to avoid the Ultra updates at all costs, which is a wonderful thing to say about the $ 200 GPU as before. they are considered “middle,” which is now the entry point.

Comparison of 6500 XT performance on both PCIe 3.0 and 4.0 platforms. (Photo: Tom’s Hardware)

All of this raises the inevitable question: why did AMD launch this GPU? It makes sense to make a card for some high-end market, then gimp until it will move slowly on the platform. I mean, who has enough new hardware to deliver PCIe 4.0, but would consider the RX 6500 XT with promotion? It doesn’t really make sense. That is, unless you have a derogatory idea that AMD figures given the high demand for GPUs right now could be very alarming. Any GPU and will be sold immediately. Like us report yesterday upon setting up the card, it has already been sold, though some types go up to $ 359, which is almost double the MSRP. This is not just another scalper, like the card in question and sold by Newegg itself. One day when you set up a card it will not be available, although AMD officials say, “we want to have more things” in an interview with PCWorld.com prior to card issuance. Of course, no one really knows what “more” means, but suffice it to say that this is not surprising to everyone right now.

Next week Nvidia will take its time in the jar by launching its RTX 3000-series entry-level GPU, RTX 3050. That GPU has both versus Radeon card, and 8GB of VRAM, 128-bit memory bus, and interface and PCIe 4.0 x16. Hopefully, it will be useful… .and gone.

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