The AMD Radeon RX Vega 64 & RX Vega 56 Review: Vega Burning Brightby Ryan Smith & Nate Oh on August 14, 2017 9:00 AM EST
Sizing Up Today’s Launch: RX Vega 64 & RX Vega 56
Now that we’ve gone through the architectural details of Vega, let’s size up today’s launch with the Radeon RX Vega 64 and Radeon RX Vega 56. While this isn’t quite a traditional one-two launch since Vega 56 doesn’t come out for another two weeks, it otherwise follows the usual pattern. That means a high-performance, fully-enabled card at the top, with its salvaged, lower-clocked, lower-priced counterpart below it.
|AMD Radeon RX Series Specification Comparison|
|AMD Radeon RX Vega 64 Liquid||AMD Radeon RX Vega 64||AMD Radeon RX Vega 56||AMD Radeon R9 Fury X|
|Memory Clock||1.89Gbps HBM2||1.89Gbps HBM2||1.6Gbps HBM2||1Gbps HBM|
|Memory Bus Width||2048-bit||2048-bit||2048-bit||4096-bit|
|Manufacturing Process||GloFo 14nm||GloFo 14nm||GloFo 14nm||TSMC 28nm|
|GPU||Vega 10||Vega 10||Vega 10||Fiji|
First off of course is the Radeon RX Vega 64. Based on a fully enabled Vega 10 GPU, this card is AMD’s best foot forward on Vega 10 performance. As it lives up to with its name, the Vega 64 ships with all 64 of Vega 10’s CUs enabled, giving the card 4096 SPs and 256 texture units. These CUs are in turn paired with AMD’s now L2 cache-backed ROPs, with a complete set of 64 of them.
In terms of clockspeed then, the Vega 64 can reach clockspeeds significantly higher than AMD’s Polaris cards, never mind the 28nm Fury X. In fact clockspeed is the single greatest resources AMD has for improving performance in existing games relative to Fury X, as while the architecture optimizations we talked about earlier do help performance in specific situations, nothing else has the raw potency and consistency of Vega’s much greater clockspeeds.
To this end the base clock is admittedly a bit low at 1247MHz, however the boost clock is at 1546MHz. As a reminder, AMD is taking a more NVIDIA-like stance with clockspeed advertising, so whereas Fury X’s boost clock was its highest attainable clockspeed (throttling when it couldn’t sustain it), RX Vega’s boost clock is the average clockspeed AMD expects the card to be able to sustain under gaming workloads. The card itself can actually boost even higher than this given a low-powered workload (e.g. something compute-heavy), with both of our sample cards boosting up to 1630MHz.
All told then, relative to its Fury X predecessor, on paper Vega 64 offers 47% higher shader, texture, geometry, and ROP throughput. These numbers don’t factor in Vega’s architecture enhancements, and in practice the actual performance gain will depend on what clockspeeds that the Vega 64 can attain, and conversely how much a given workload benefits from those aforementioned architectural improvements. So as with past architecture launches, the specs are only half of the story and the benchmarks will play the rest.
Paired with the Vega 10 GPU is 8GB of HBM2 memory, in the form of a pair of 4-Hi 4GB stacks. The two stacks are connected to Vega 10 via a 2048-bit wide memory bus running through the silicon interposer, and coupled with HBM2’s improved clockspeeds, gives Vega 10 GPU a lot of memory bandwidth in little space. AMD has clocked the memory at 1.89Gbps, giving the Vega 64 484GB/sec of memory bandwidth. With the original goal for the flagship card being a 2Gbps data rate (for a total of 512GB/sec) this does put Vega 64 at a slight disadvantage versus the previous Fury X. Which means that from an architectural perspective, AMD has to do more with slightly less.
Moving on, for better or worse the Vega 64 is a high-powered card in all senses of the word. AMD’s official board power specification for the card is 295W. Board power is a bit of a new metric for AMD; in previous generations they have published the typical board power of a card, whereas the 295W value here is no longer considered typical. Truthfully I don’t have a full grasp of the difference, but given our data and the fact that this value is higher than the Fury X’s typical board power of 275W, and this seems to function closer to a maximum for AMD. Which means that depending on the scenario a card can draw less than 295W, however as virtually all GPU-bound scenarios are also power-bound scenarios, it’s as good a number as any for a full load power specification.
For AMD, a high board power specification isn’t especially new. Fury X, Fury, and the R9 290X all shipped with high TBPs as well. But it means buyers should set their expectations accordingly for how the card will compare to past cards and the competition in terms of power consumption, and what acoustics might be like on this blower-based card.
Finally, while we’re not reviewing it today, AMD also has the RX Vega 64 Liquid Cooled edition. AMD is wisely not treating this card as the “baseline” performance of the Vega 64, but rather an enhanced enthusiast edition. This card has a boost clock rating of 1677MHz – 131Mhz above the air cooled card – and should perform a bit better than its non-liquid counterpart. However power consumption has more than gone up to match, with a 345W board power rating. This is going to be a low-volume halo part for enthusiasts who want the fastest Vega 64 possible, regardless of what it means for pricing or power consumption, and AMD is treating it accordingly.
Radeon RX Vega 56
Second on deck for today’s review embargo and arguably the focus of AMD’s promotional efforts is the Radeon RX Vega 56. The lower-tier counterpart to the RX Vega 64, the RX Vega 56 is the obligatory cut-down version of the RX Vega family. This features the same Vega 10 GPU as the Vega 64, however as accurately described in the name, only 56 of the 64 CUs are enabled on this card, leaving it with 3584 stream processors and 224 texture units.
Clockspeeds have also been cut down for the Vega 56, leading to the card shipping with a 1156MHz base clock and 1471MHz boost clock. On paper then, it offers 83% of the RX Vega 64’s compute and texturing performance, and 95% of the Vega 64’s ROP and geometry performance. Consequently, how the Vega 56 will perform in games has the potential to swing anywhere between a solid step below AMD’s flagship card, and something that gets a bit too close for comfort.
Meanwhile like its high-tier counterpart, the Vega 56 gets 8GB of HBM2 memory. Like its GPU clockspeed, memory clockspeeds have also been reduced to a less aggressive frequency here, leading to AMD shipping the card with a 1.6Gbps data rate. All told then, this gives the Vega 56 410GB/sec of memory bandwidth to work with, about 85% of Vega 64’s. Given that Vega 56’s compute/shading throughput is also about 85% of Vega 64’s, you can see how this memory configuration is a good match for Vega 56’s GPU configuration.
The upside of pulling back on performance is that AMD has also been able to pull back on power consumption. Vega 56 shaves 85W off of its board power rating, bringing it down to 210W. Which considering that on paper Vega 56 should deliver 85% of the performance of Vega 64, doing so at 71% of the power consumption looks very tantalizing in its own way.
The one catch specific to the Vega 56’s launch however is that it isn’t. Only the Vega 64 is launching today, while the Vega 56 will not be for sale until August 28th, making this a bit of a paper launch.
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MatthiasP - Monday, August 14, 2017 - linkOnly poor people buy the air cooled Vega and not the liquid one.
FreckledTrout - Monday, August 14, 2017 - linkLOL I care about power consumption because it makes my computer loud. Did you see how loud t he Vega 64 is, way way to many db's for me. So some not "poor" people care.
Aldaris - Monday, August 14, 2017 - linkFreckled, did you not pay attention to that graph? It's basically as loud as Nvidia's offerings.
sorten - Monday, August 14, 2017 - linkIf by "basically as loud" you mean that the AMD cards are 10% louder, then yes. Power draw translates to heat and, typically, noise. I would never buy the AMD cards given the power draw, but to each their own.
Brett Howse - Monday, August 14, 2017 - linkdB is a logarithmic scale. 3dB means twice as much sound, although we don't perceive it as that much. Closer to 10 dB would be perceived as twice as loud. Vega 64 vs 1080 FE is about 7 dB difference, which isn't "basically as loud" it's going to be perceived as a lot louder.
Lazacom - Tuesday, August 15, 2017 - linkNope, logarithmic sound scale means 3dB is around 23% larger amplitude of sound waves. 10dB is perfect 2 times more. But our ears usually don't register 1-3dB difference. On the other hand, 7dB should be heard as difference, but again depends what frequencies are most loud, around 1kHz are most noticeable. If they wrote it basically as loud, probably there are lower frequencies spikes contrary to 1080Ti...
bcronce - Tuesday, August 15, 2017 - linkDecibel is base 10. 10dB is 10x more energy. 3dB is about 47% more energy.
Dug - Tuesday, August 15, 2017 - linkAnyone that deals with audio, knows that 3db is noticeable. 1db is perceivable, but not usually noticed if it's constant. The issue with sound from a case is that it can actually be like a speaker, so just because the card is 3db more at 1m in free air, it can become quite a bit louder due to cabinet size and materials. Just like putting a case under a desk can sometimes be louder than if on top of the desk. Last is heat. If case fans have to operate at higher levels to keep heat from video card down, then this will add to perceived loudness.
Exodite - Monday, August 14, 2017 - linkWhile the power consumption of the cards, Vega 64 in particular, is disappointing I'd await 3rd party cooling systems before judging.
The stock AMD cooling solution has been terrible since, well, forever really. And while I prefer AMD GPUs I've learned to avoid stock cards like the plague.
mapesdhs - Monday, August 14, 2017 - linkExodite, 3rd party coolers can help with the noise, but I can't see them doing much about the power behaviour.