The AMD Vega GPU tech has been around in consumer form for the last six months, and it seems to have had a bumpy start to life. But with its sterling showing in the Raven Ridge APUs, new mobile cards on the way, and Vega apprearing as AMD’s first 7nm product the architecture’s certainly getting around a bit. At launch, however, it was rather a silicon contradiction – the first cards managed to be simultaneously disappointing and completely sell out.Ai??
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The Vega launch felt classically AMD: they worked hard to create some interesting hardware, with some unique selling points, but it turned out a little too forward-thinking, and not competitive enough right now, to be worth the outlay. Thereai??i??s also the potential problem that when the forward-thinking side of the Vega tech does become useful this iteration of it will be outdated.
Unfortunately, right now, the AMD RX Vega cards suffer by comparison to their smaller, more efficient, and more powerful Nvidia competition.
AMD Vega reviews
AMD Vega news
- AMD Vega pricing and availability
The RX Vega 64 and RX Vega 56 were both hard to track down for a decent price long after launch, but stock is coming back, and pricing getting closer to the $499 (A?450) and $399 (A?350) respective MSRP.
- AMD Vega architecure
AMD called it the biggest architectural change in years, with a brand new Infinity Fabric interconnect, memory, and caching system.
- AMD Vega performance
The biggest disappointment was that, after all the hype, the top AMD RX Vega 64 couldn’t really keep up with the Nvidia GTX 1080 it was aiming its sights on.
There are still only a pair of gaming-focused AMD RX Vega cards: the Radeon RX Vega 64 and the Radeon RX Vega 56. These both essentially sport the same Vega 10 GPU at their hearts, utilising the full 14nm, 12.5bn transistor silicon, with only a few small cuts to make up the lower-spec card.
ThereAi??mightAi?? be more custom versions of the RX Vega cards coming sometime this year. Maybe. There are some pre-orders floating around. At the moment there are so few GPU packages actually coming out of AMD that their board partners are struggling to get even just the reference models out into the wild, let alone ones with their own coolers and overclocked silicon.
Asus showed off an early STRIX version, to a rather muted response, but MSI, Gigabyte, and even AMD big boys, Sapphire, are being rather coy about whether there are going to be any custom cards from them. It looks like we might get some RX Vega 56 variants, but the flagship RX Vega 64 looks almost dead in the water.
You will,Ai??however, be getting Vega graphics in processor form, and not just from the AMD Raven Ridge APUs either. Intel have licensed Vega GPU silicon to form the graphics portion of the Intel Kaby Lake G processors, mixing Radeon and Core architectures together for the first time. It’s an alliance predicted by Nostradamus himself as a portent of the end times.
There willAi??also be mobile Vega cards, as mentioned by Dr. Lisa Su herself at the pre-CES event in Las Vegas this January. But it looks like any hopes we might have had for a Vega GPU refresh, along the same lines as that facing the inaugural Ryzen CPU range with theAi??AMD Ryzen 2 Pinnacle RidgeAi??updates coming this year, have seemingly been dashed this month.
Originally we had been hoping that AMD would be creating a 12nm refresh of the Vega 56 and Vega 64 cards, sporting the same level of efficiency improvements and higher clockspeeds the Ryzen 2 refresh is offering. Unfortunately the Vega refresh has been removed from the new AMD roadmaps we were shown at their CES Tech Day in January.
InsteadAi??AMD are bringing a 7nm version of the Vega architectureAi??to market at the end of the year – likely unveiling at SIGGRAPH in August – in the guise of a new Radeon Instinct card designed specifically for the rigours of machine learning. There is a slight chance that release, like the original Vega Instinct cards, will eventually bleed into a consumer-facing product launch, but maybe not this year.
It looks like the next graphics component we’re getting from AMD right now is going to be based on the newAi??AMD NaviAi??design sometime in 2019.
The new AMD Vega architecture represents what theyai??i??re calling the most sweeping architectural change their engineers have made to the GPU design in five years. That was when the first Graphics Core Next chips hit the market and this fifth generation of the GCN architecture marks the start of a new GPU era for the Radeon team.
Fundamental to the Vega architecture, represented here by the inaugural Vega 10 GPU, is the hunt for higher graphics card clockspeeds. The very building blocks of the Vega 10, the compute units, have been redesigned from the ground up, almost literally. These next-generation compute units (NCU) have had their floorplans completely reworked to optimise and shorten the physical wiring of the connections inside them.
They also include high-speed, mini memory SRAMs, stolen from the Zen CPUs and optimised for use on a GPU. But thatai??i??s not the only way the graphics engineers have benefitted from a resurgent CPU design team; theyai??i??ve also nabbed the high-performance Infinity Fabric interconnect, which enables the discrete quad-core modules, used in Ryzen and Ryzen Threadripper processors, to talk to each other.Ai??
Vega uses the Infinity Fabric to connect the GPU core itself to the rest of the graphics logic in the package. The video acceleration blocks, the PCIe controller and the advanced memory controller, amongst others, are all connected via this high-speed interface. It also has its own clock frequency too, which means itai??i??s not affected by the dynamic scaling and high frequency of the GPU clock itself.
This introduction of Infinity Fabric support for all the different logic blocks makes for a very modular approach to the Vega architecture and that in turn means it will, in theory, be easy for AMD to make a host of different Vega configurations. It also means future GPU and APU designs (think the Ryzen/Vega-powered Raven Ridge) can incorporate pretty much any element of Vega they want to with minimal effort.
The NCUs still contain the same 64 individual GCN cores inside them as the original graphics core next design, with the Vega 10 GPU then capable of housing up to 4,096 of these liai??i??l stream processors. But, with the higher core clockspeeds, and other architectural improvements of Vega, theyai??i??re able to offer far greater performance than any previous GCN-based chip.
The new NCUs are also capable of utilising a feature AMD is calling Rapid Packed Math, and which Iai??i??m calling Rapid Packed Maths, or RPM to avoid any trouble with our US cousins. RPM essentially allows you to do two mathematical instructions for the price of one, but does sacrifice the accuracy. Given many of todayai??i??s calculations, especially in the gaming space, donai??i??t actually need 32-bit floating point precision (FP32), you can get away with using 16-bit data types. Game features, such as lighting and HDR, can use FP16 calculations and with RPM that means Vega can support both FP16 and FP32 calculations as and when they’re necessary.
Weai??i??ll see the first game supporting RPM, and other Vega-supported features, like asynchronous compute, when Wolfenstein II: The New Colossus launches. The Far Cry 5 developers have also come out in support of RPM, and could make FC5 very Vega-friendly. 3D technical lead, Steve Mcauley, has gone on record stating: ai???thereai??i??s been many occasions recently where Iai??i??ve been optimising shaders thinking that I really wish I had rapid packed math available to me right now. [It] means the game will run at a faster, higher frame rate, and a more stable frame rate as well, which will be great for gamers.ai???
The Vega architecture also incorporates a new geometry engine, capable of supporting both standard DirectX-based rendering as well as the ability to use newer, more efficient rendering pipelines through primitive shader support. The revised pixel engine has been updated to cope with todayai??i??s high-resolution, high refresh rate displays, and AMD have doubled the on-die L2 cache available to the GPU. They have also freed the entire cache to be accessible by all the different logic blocks of the Vega 10 chip, and thatai??i??s because of the brand new memory setup of Vega.
AMDai??i??s Vega architecture uses the second generation of high-bandwidth memory (HBM2) from Hynix. HBM2 has higher data rates, and larger capacities, compared with the first generation used in AMDai??i??s R9 Fury X cards. It can now come in stacks of up to 8GB, with a pair of them sitting directly on the GPU die, making the memory both more efficient and with a smaller footprint compared to standard graphics chip designs. And that could make it a far more tantalising option for notebook GPUs.
Directly connected with the HBM2 is Vegaai??i??s new high-bandwidth cache and high-bandwidth cache controller (HBCC). Ostensibly this is likely to be of greater use, at least in the short term, on the professional side of the graphics industry, but the HBCCai??i??s ability to use a portion of the PCai??i??s system memory as video memory should bare gaming fruit in the future. The idea is that games will see the extended pool as one large chunk of video memory, so if tomorrowai??i??s open-world games start to require more than the Vega 64ai??i??s 8GB you can chuck it some of your PCai??i??s own memory to compensate for any shortfall.
“You are no longer limited by the amount of graphics memory you have on the chip,” AMDai??i??s Scott Wasson explains. “It’s only limited by the amount of memory or storage you attach to your system.”
The Vega architecture is capable of scaling right up to a maximum of 512TB as the virtual address space available to the graphics silicon. Nobody tell Chris Roberts or we wonai??i??t see Star Citizen this side of the 22nd century.
The thinking behind Vega seems to have been to put the RX Vega 64 up against the GTX 1080 with the RX Vega 56 going head-to-head with the GTX 1070. Unfortunately, with most games on the market today, the AMD cards are always that little bit behind the Nvidia GPUs. Itai??i??s only when you start looking at the more modern DirectX 12 and Vulkan APIs that the Vega architecture starts to show its worth.
Itai??i??s this bifurcated performance – poor in legacy games and impressive with modern software – that makes the Vega cards difficult to recommend right now. AMDai??i??s classic ai???fine wineai??i?? approach may mean that when architecture matures, and devs start to use the impressive feature set to its fullest, the AMD cards might be able to push past their Nvidia rivals.
But thatai??i??s scant comfort to anyone wanting class-leading performance for every game in their Steam libraries, or even just the games theyai??i??re playing at the moment. There is a little light at the end of the overclocking tunnel however, with tweakers uncovering increased capabilities of the card, unlocked by undervolting the GPU. But thatai??i??s a whole other story…
We’re starting to see more RX Vega cards becoming available now. And, almost more importantly, at prices that are much more akin to the MSRP AMD originally set out for the new GPUs. There are still some pre-order cards available at both Amazon US and Amazon UK, but there are also actual cards you can buy.
In the US,Ai??Newegg, are still struggling to offer anything that isnai??i??t pricing the new Radeons out of relevance, with the cheapest RX Vega 64 coming in at $680.
Itai??i??s a little better on the verdant shores of the UK, where the likes of Overclockers and Scan have some reasonably priced stock and available cards actually around the price AMD launched the GPUs with.
AMD RX Vega 64 prices
AMD RX Vega 56 prices
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