06-11-2019, 08:40 AM
https://www.tomshardware.com/news/amd-na...39608.html
Quote:AMD’s CPU team looks to be firing on all cylinders, having just announced third-gen Ryzen processors that purportedly beat Intel’s line-up in performance and pricing comparisons. Meanwhile, the Radeon Technologies Group desperately needs a win of its own after years of playing catch-up. Radeon RX 5700 XT and Radeon RX 5700, both based on the much-anticipated Navi GPU, won’t be the cards to beat Nvidia’s highest-end GeForce RTX models. However, they may be able to knock off GeForce RTX 2070 and 2060, provided the company can price them properly and ship in sufficient quantity.
The Radeon RX 5700 XT wields 2,560 Stream processors and 160 texture units, divided up into 40 Compute Units. At a peak Boost clock of 1,905 MHz, those CUs facilitate up to 9.75 TFLOPS of compute performance. On paper, that’d put the card somewhere between Radeon RX 590 and Radeon RX Vega 56. However, AMD is specifying clock rates a little differently this time around, so Boost frequency may just be a vanity rating. The more realistic spec is 1,755 MHz. AMD says this Game clock represents a typical rate across more than 20 games it tested, so expect to see cards running somewhere between the Game and Boost frequencies. A 1,605 MHz base clock should be sustainable, even through a worst-case workload like FurMark.
AMD pairs the Radeon RX 5700 XT to 8GB of GDDR6 memory transferring data at 14 Gbps over a 256-bit bus. The resulting 448 GBps of theoretical bandwidth exceeds the 410 GBps available to Radeon RX Vega 56 through its 8GB of HBM2, but trails Radeon RX Vega 64’s 483 GBps.
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The vanilla Radeon RX 5700 receives a relatively minor haircut, losing four CUs and 256 Stream processors. The remaining 2,304 ALUs and 144 texture units operate at a typical Game clock of 1,625 MHz and a 1,465 MHz base clock. AMD says the 5700 can hit a 1,725 MHz Boost clock, though, and that’s where it calculates this board’s 7.95 TFLOPS compute performance. All 64 of Navi’s ROPs are preserved in moving from Radeon RX 5700 XT to 5700, as is the chip’s 256-bit aggregate memory bus and 4MB last-level cache.
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Navi does not incorporate hardware support for ray tracing in any form. Rather, David Wang, SVP of AMD’s Radeon Technologies Group, told us that existing GCN- and RDNA-based GPUs would support ray tracing via shaders in ProRender (for creators) and Radeon Rays (for developers). Then, down the road, a next-gen implementation of RDNA will evolve to accelerate “select lighting effects for real-time gaming.” AMD’s vision culminates in full scene ray tracing through the cloud. Could the company mean that it sees heavy lifting handled remotely as gamers stream content? We can’t imagine the PC audience would be overwhelmingly receptive to such a proposition. Regardless, AMD believes it’ll be a few years before real-time ray tracing takes off.