The AMD Radeon VII Review: An Unexpected Shot At The High-End
by Nate Oh on February 7, 2019 9:00 AM ESTFP64 Performance and Separating Radeon VII from Radeon Instinct MI50
One of the interesting and amusing consequences of the Radeon VII launch is that for the first time in quite a while, AMD has needed to seriously think about how they’re going to differentiate their consumer products from their workstation/server products. While AMD has continued to offer workstation and server hardware via the Radeon Pro and Radeon Instinct series, the Vega 20 GPU is AMD’s first real server-grade GPU in far too long. So, while those products were largely differentiated by the software features added to their underlying consumer-grade GPUs, Radeon VII brings some new features that aren’t strictly necessary for consumers.
It may sound like a trivial matter – clearly AMD should just leave everything enabled – but as the company is trying to push into the higher margin server business, prosumer products like the Radeon VII are in fact a tricky proposition. AMD needs to lock away enough of the server functionality of the Vega 20 GPU that they aren’t selling the equivalent of a Radeon Instinct MI50 for a fraction of the price. On the other hand, it’s in their interest to expose some of these features in order to make the Radeon VII a valuable card in its own right (one that can justify a $699 price tag), and to give developers a taste of what AMD’s server hardware can do.
Case in point is the matter of FP64 performance. As we noted in our look at the Vega 20 GPU, Vega 20’s FP64 performance is very fast: it’s one-half the FP32 rate, or 6.9 TFLOPS. This is one of the premium features of Vega 20, and since Radeon VII was first announced back at CES, the company has been struggling a bit to decide how much of that performance to actually make available to the Radeon VII. At the time of its announcement, we were told that the Radeon VII would have unrestricted (1/2) FP64 performance, only to later be told that it would be 1/8. Now, with the actual launch of the card upon us, AMD has made their decision: they’ve split it down the middle and are doing a 1/4 rate.
Looking to clear things up, AMD put out a statement:
The Radeon VII graphics card was created for gamers and creators, enthusiasts and early adopters. Given the broader market Radeon VII is targeting, we were considering different levels of FP64 performance. We previously communicated that Radeon VII provides 0.88 TFLOPS (DP=1/16 SP). However based on customer interest and feedback we wanted to let you know that we have decided to increase double precision compute performance to 3.52 3.46 TFLOPS (DP=1/4SP).
If you looked at FP64 performance in your testing, you may have seen this performance increase as the VBIOS and press drivers we shared with reviewers were pre-release test drivers that had these values already set. In addition, we have updated other numbers to reflect the achievable peak frequency in calculating Radeon VII performance as noted in the [charts].
The end result is that while the Radeon VII won’t be as fast as the MI60/MI50 when it comes to FP64 compute, AMD is going to offer the next best thing, just one step down from those cards.
At 3.5 TLFLOPS of theoretical FP64 performance, the Radeon VII is in a league of its own for the price. There simply aren’t any other current-generation cards priced below $2000 that even attempt to address the matter. All of NVIDIA’s GeForce cards and all of AMD’s other Radeon cards straight-up lack the necessary hardware for fast FP64. The next closest competitor to the Radeon VII in this regard is NVIDIA’s Titan V, at more than 4x the price.
It’s admittedly a bit of a niche market, especially when so much of the broader industry focus is on AI and neural network performance. But there’s none the less going to be some very happy data scientists out there, especially among academics.
| AMD Server Accelerator Specification Comparison | ||||
| Radeon VII | Radeon Instinct MI50 |
Radeon Instinct MI25 |
FirePro S9170 | |
| Stream Processors | 3840 (60 CUs) |
3840 (60 CUs) |
4096 (64 CUs) |
2816 (44 CUs) |
| ROPs | 64 | 64 | 64 | 64 |
| Base Clock | 1450MHz | 1450MHz | 1400MHz | - |
| Boost Clock | 1750MHz | 1746MHz | 1500MHz | 930MHz |
| Memory Clock | 2.0Gbps HBM2 | 2.0Gbps HBM2 | 1.89Gbps HBM2 | 5Gbps GDDR5 |
| Memory Bus Width | 4096-bit | 4096-bit | 2048-bit | 512-bit |
| Half Precision | 27.6 TFLOPS | 26.8 TFLOPS | 24.6 TFLOPS | 5.2 TFLOPS |
| Single Precision | 13.8 TFLOPS | 13.4 TFLOPS | 12.3 TFLOPS | 5.2 TFLOPS |
| Double Precision | 3.5 TFLOPS (1/4 rate) |
6.7 TFLOPS (1/2 rate) |
768 GFLOPS (1/16 rate) |
2.6 TFLOPS (1/2 rate) |
| DL Performance | ? | 53.6 TFLOPS | 12.3 TFLOPS | 5.2 TFLOPS |
| VRAM | 16GB | 16GB | 16GB | 32GB |
| ECC | No | Yes (full-chip) | Yes (DRAM) | Yes (DRAM) |
| Bus Interface | PCIe Gen 3 | PCIe Gen 4 | PCIe Gen 3 | PCIe Gen 3 |
| TDP | 300W | 300W | 300W | 275W |
| GPU | Vega 20 | Vega 20 | Vega 10 | Hawaii |
| Architecture | Vega (GCN 5) |
Vega (GCN 5) |
Vega (GCN 5) |
GCN 2 |
| Manufacturing Process | TSMC 7nm | TSMC 7nm | GloFo 14nm | TSMC 28nm |
| Launch Date | 02/07/2019 | 09/2018 | 06/2017 | 07/2015 |
| Launch Price (MSRP) | $699 | - | - | $3999 |
Speaking of AI, it should be noted that machine learning performance is another area where AMD is throttling the card. Unfortunately, more details aren’t available at this time. But given the unique needs of the ML market, I wouldn’t be surprised to find that INT8/INT4 performance is held back a bit on the Radeon VII. Or for that matter certain FP16 dot products.
Also on the chopping block is full-chip ECC support. Thanks to the innate functionality of HBM2, all Vega cards already have free ECC for their DRAM. However Vega 20 takes this one step further with ECC protection for its internal caches, and this is something that the Radeon VII doesn’t get access to.
Finally, Radeon VII also cuts back a bit on Vega 20’s off-chip I/O features. Though AMD hasn’t made a big deal of it up to now, Vega 20 is actually their first PCI-Express 4.0-capable GPU, and this functionality is enabled on the Radeon Instinct cards. However for Radeon VII, this isn’t being enabled, and the card is being limited to PCIe 3.0 speeds (so future Zen 2 buyers won’t quite have a PCIe 4.0 card to pair with their new CPU). Similarly, the external Infinity Fabric links for multi-GPU support have been disabled, so the Radeon VII will only be a solo act.
On the whole, there’s nothing very surprising about AMD’s choices here, especially given Radeon VII’s target market and target price. But these are notable exclusions that are going to matter to certain users. And if not to drive those users towards a Radeon Instinct, then they’re sure to drive those users towards the inevitable Vega 20-powered Radeon Pro.
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Oxford Guy - Thursday, February 7, 2019 - link
This card is a turkey for gamers. AMD fixed the noise level problem with Fury X and now we're getting less value than we did then. It's too loud."Also new to this card and something AMD will be keen to call out is their triple-fan cooler, replacing the warmly received blower on the Radeon RX Vega 64/56 cards."
Is the sarcasm really necessary? If you're going to mention the cooler thing why not point out just how far AMD has regressed in terms of noise. Remember Fury X, a card that is nice under load?
"Vega 20 has nothing on paper to push for its viability at consumer prices. And yet thanks to a fortunate confluence of factors, here we are."
Oh please:
Fiji: 596 mm2 for $650. Vega 10 495 mm2 for $500. Vega 20 331 mm2 for $700.
Anandtech says it's all so shocking that Vega 20 is available to consumers at all. Eyeroll. No. For $700, AMD could have put that extra die area to more use and given us 8 GB of VRAM. But that would involve doing the impossible and making a GPU that is attractive to gamers, not just peddling low-end Polaris rehashes indefinitely.
Consumers aren't getting the best value here. They're getting leftovers just as they did with Bulldozer/Piledriver — parts that were targeted at the server market first and not consumers. At least with Vega 20, though, there is some competitiveness, although this is mainly because Nvidia is artificially crippling the value of the GPU market with its inflated pricing strategy. That is what monopolies do, of course. Look at how long Intel was able to coast with Sandy-level performance.
"At 3.5 TLFLOPS of theoretical FP64 performance, the Radeon VII is in a league of its own for the price. There simply aren’t any other current-generation cards priced below $2000 that even attempt to address the matter."
That's marvelous for the people who are able to care about FP64, unlike gamers.
This is what happens when there isn't enough competition in a market. Gamers get the choice of two shafts: Turing and Vega.
Oxford Guy - Thursday, February 7, 2019 - link
Oh, yes... and the "console".At least the Switch is a real console. I'm not talking about that. I'm talking about awful low-end PCs being falsely called consoles, which has been the practice since Jaguar became an (unfortunate) thing.
Korguz - Friday, February 8, 2019 - link
like in a previous post of yours.. are you forgetting that the xbox and xbox 360 were also, " low end " pc's that your are claiming ?? the switch is a real console ?? ha.. the nintendo switch, is based off of the Tegra SoC's from nvidia... in a way.. " still " a low end PC......Oxford Guy - Friday, February 8, 2019 - link
The reason the Switch qualifies as a console is that it does something differently vis-à-vis the x86 gaming PC platform. It has a different form factor and related functionality. Artificial software walled gardens do not truly differentiate Sony and MS's low-end PCs from the PC gaming market. They are merely anti-consumer kludge that people have chosen to prop up with their cash.Merely having an x86 processor does not make something equivalent to an x86 PC. The Switch is clearly not the same thing as a low-end PC box like a Jaguar-based rubbish console. I am not particularly enamored with the Switch but at least Nintendo is offering something different to better justify its approach.
Korguz - Friday, February 8, 2019 - link
this sounds more like your own personal opinion and nothing more.. for some reason you hate the current consoles, and seems like there is NO reason for your hate...nintendo has offered something different for a console since the 1st Wii, and honestly, look where it has gotten them... the xbox and playstation platforms outsold the nintendo systems, up to the switch, which has out sold the other 2.. but the games them selves on the nintendo systems.. are lacking..
Oxford Guy - Friday, February 8, 2019 - link
"this sounds more like your own personal opinion and nothing more.. for some reason you hate the current consoles, and seems like there is NO reason for your hate..."Ad hominem isn't a rebuttal.
Korguz - Friday, February 8, 2019 - link
still just sounds like your personal opinion, regardlessHorzaG - Sunday, February 10, 2019 - link
Pointing out that (according to the poster) you're just expressing your opinion and "hate" without reasoning isn't an Ad hominem, you used the term incorrectly earlier in this thread also. Pretty embarrassing to be simultaneously so conceited and so wrong."You should never listen to a word Oxford Guy has to say because he's a frothing fanboy whose posts reek of desperation and are probably indicative of an inability to get laid"
That's an Ad hominem.
Korguz - Tuesday, February 12, 2019 - link
and saying this :" You should never listen to a word Oxford Guy has to say because he's a frothing fanboy whose posts reek of desperation and are probably indicative of an inability to get laid "
about someone.. doesnt prove your point any better...
Oxford Guy - Wednesday, February 13, 2019 - link
"Pretty embarrassing to be simultaneously so conceited and so wrong."It must be.