PCWorld – August 2019

62 PCWorld AUGUST 2019

REVIEWS AMD RADEON RX 5700 AND 5700 XT

replacing in AMD’s product stack. (Radeon

boss Scott Herkelman confirmed that Vega

will be disappearing in The Full Nerd

interview at go.pcworld.com/sctt.)

While that table (see page 61 and above)

provides a helpful overview, note that you

cannot simply compare the number of

compute units and stream processors

between the Vega GPUs and the “Navi”

GPUs in the Radeon RX 5700 series.

Compared to AMD’s long-lasting GCN

architecture (which Vega is based on), the

new RDNA architecture introduces several

radical changes to the underlying GPU

design, unleashing significant hardware-level

overhauls to everything from the cache to the

graphics engine to the compute units

themselves. These new graphics cards

perform tasks differently from their

predecessors at a fundamental level.

We’re not going to get into the weeds of

redesigned cache hierarchies and SIMD

GPU RADEON RX

5700 XT

RADEON RX

5700

RADEON RX

VEGA^64

RADEON RX

VEGA^56

Peak SP

Performance

Up to 9.75

TFLOPS

Up to 7.95

TFLOPS

Up to 12.7 TFLOPS Up to 10.5

TFLOPS

Peak Half

Precision

Performance

Up to 19.5

TFLOPS

Up to 15.9

TFLOPS

Up to 25.3 TFLOPS Up to 21 TFLOPS

Peak Texture Fill-

Rate

Up to 304.8 GT/s Up to 248.4 GT/s Up to 395.8 GT/s Up to 330 GT/s

ROPs 64 64 64 64

Peak Pixel Fill-

Rate

Up to 121.9 GP/s Up to 110.4 GP/s Up to 98.9 GP/s Up to 94 GP/s

Memory 8GB GDDR6 8GB GDDR6 8GB HBM 8GB HBM

Memory

Bandwidth

448 GB/s 448 GB/s 483.8 GB/s 410 GB/s

Memory

Interface

256-bit 256-bit 2,048-bit 2,048-bit

Board Power 225 Watts 185 Watts 295 Watts 210 Watts

AMD RADEON RX 5700 XT/RX 5700/

RX VEGA^64 /R X VEGA^56 SPECS CONTINUED