Last month AMD held their 30 years of graphics celebration, during which they announced their next Radeon video card, the Radeon R9 285. Designed to be AMD’s new $249 midrange enthusiast card, the R9 285 would be launching on September 2nd. In the process the R9 285 would be a partial refresh of their R9 280 series lineup, supplying it with a new part that would serve to replace their nearly 3 year old Tahiti GPU.

The R9 285 is something of a lateral move for AMD, which is something we very rarely see in this industry. The R9 285’s immediate predecessor, the R9 280 (vanilla) has been on the market with an MSRP of $249 for nearly 4 months now. Meanwhile the R9 285 is not designed to be meaningfully faster than the R9 280 – in fact if you looked at the raw specifications, you’d rightfully guess it would be slower. Instead the R9 285 is intended to serve as a sort of second-generation feature update to R9 280, replacing it with a card at the same price with roughly the same performance level, but with 3 years’ worth of amassed feature updates and optimizations.

To accomplish this AMD has minted a new GPU, Tonga. We’ll go into more detail on Tonga in a bit, but at its core Tonga is in many ways an optimized version of Tahiti. More importantly though, Tonga is also the first GPU in AMD’s next Graphics Core Next architecture revision, which we will come to know as GCN 1.2. As a result, this launch won’t come with a significant shift in AMD’s performance-value, but for buyers it offers an improved feature set for those apprehensive about buying into Tahiti 3 years later, and for enthusiast it offers us a look at what the next iteration of AMD’s GPUs will look like.

AMD GPU Specification Comparison
  AMD Radeon R9 290 AMD Radeon R9 280X AMD Radeon R9 285 AMD Radeon R9 280
Stream Processors 2560 2048 1792 1792
Texture Units 160 128 112 112
ROPs 64 32 32 32
Core Clock 662MHz 850MHz ? 827MHz
Boost Clock 947MHz 1000MHz 918MHz 933MHz
Memory Clock 5GHz GDDR5 6GHz GDDR5 5.5GHz GDDR5 5GHz GDDR5
Memory Bus Width 512-bit 384-bit 256-bit 384-bit
VRAM 4GB 3GB 2GB 3GB
FP64 1/8 1/4 1/16 1/4
TrueAudio Y N Y N
Typical Board Power 250W 250W 190W 250W
Manufacturing Process TSMC 28nm TSMC 28nm TSMC 28nm TSMC 28nm
Architecture GCN 1.1 GCN 1.0 GCN 1.2 GCN 1.0
GPU Hawaii Tahiti Tonga Tahiti
Launch Date 11/05/13 10/11/13 09/02/14 03/04/14
Launch Price $399 $299 $249 $279

Diving into the R9 285’s raw specifications, the card utilizes a 1792 stream processor Graphics Core Next GPU. Paired with these SPs are 112 texture units (in the standard 16:1 ratio), and on the backend of the rendering pipeline is 32 ROPs. As is unfortunately consistent for AMD, they are not disclosing the product’s base clockspeed, but they have published the boost clockspeed of 918MHz.

Meanwhile feeding R9 285’s GPU falls to the card’s 2GB of GDDR5. This is on a 256-bit bus, and is clocked at 5.5GHz for a total memory bandwidth of 176GB/sec.

The R9 285 will have a rated typical board power (AMD’s analogue for TDP) of 190W. Notably this is only 10W higher than the Pitcairn based R9 270X despite the 40% larger SP count, or alternatively is 60W lower than the Tahiti based R9 280. Taking into consideration the R9 270X comparison in particular, it’s clear that AMD has done some work on efficiency to squeeze out more compared to the GCN 1.0 based Pitcairn and Tahiti parts that R9 285 is going to be competing with.

The GPU itself, Tonga, is AMD’s first released GCN 1.2 GPU, with R9 285 arriving before the previously announced Tonga-based FirePro W7100. We’ll dive into further detail into GCN 1.2 on the following pages, but from a high level overview Tonga looks a lot like an optimized Tahiti. AMD has confirmed that R9 285 is not utilizing a “full” Tonga configuration, so R9 285 is not the highest possible configuration for Tonga.

 

A complete Tonga configuration will contain 2048 SPs, just like its Tahiti predecessor, with 1792 of those SPs active on R9 285. This is paired with the card’s 32 ROPs attached to a 256-bit memory bus, and a 4-wide (4 geometry processor) frontend. Compared to Tahiti the most visible change is the memory bus size, which has gone from 384-bit to 256-bit. In our look at GCN 1.2 we’ll see why AMD is able to get away with this – the short answer is compression – but it’s notable since at an architectural level Tahiti had to use a memory crossbar between the ROPs and memory bus due to their mismatched size (each block of 4 ROPs wants to be paired with a 32bit memory channel). The crossbar on Tahiti exposes the cards to more memory bandwidth, but it also introduces some inefficiencies of its own that make the subject a tradeoff.

Meanwhile Tonga’s geometry frontend has received an upgrade similar to Hawaii’s, expanding the number of geometry units (and number of polygons per clock) from 2 to 4. And there are actually some additional architectural efficiency improvements in here that should further push performance per clock beyond what Hawaii can do in the real world.

The final die size of Tonga is 359mm2 and it packs an unexpectedly high 5 billion transistors. Compared to Tahiti, this is a very slight (7mm2) increase in die size, while the transistor count has gone up by nearly 700M from Tahiti’s 4.31B transistors. Tonga’s configuration and die size indicate that AMD has made some interesting tradeoffs in terms of die size and features. The narrower memory bus means that AMD was able to drop a pair of memory controllers and the memory crossbar, only for AMD to fill it in with the additional transistors needed to drive all of the additional features (and geometry processors) that Tahiti lacked.


Tonga & VRAM. Image Courtesy Hardware.FR

Consequently R9 285 isn’t just a lateral in performance, but from a die size and cost standpoint it should be equally lateral, with Tonga being roughly as expensive to produce as Tahiti. However final boards should be slightly cheaper to produce than R9 280 boards – the 256-bit memory bus allows for simpler boards, it only has 2GB of VRAM instead of 3GB, and the reduced power consumption allows for less complex power delivery circuitry.

Otherwise when it comes to features, being GCN 1.2 based means that the R9 285 will bring with it support for all of the features first introduced in GCN 1.1. This includes support for True Audio, support for bridgeless CrossFire thanks to the XDMA engine, GCN 1.1’s superior boost mechanism, and full support for AMD’s upcoming FreeSync implementation of DisplayPort Adaptive Sync (GCN 1.0 GPUs are not fully adaptive).

AMD will be positioning the R9 285 to compete with NVIDIA’s GeForce GTX 760, the company’s second-tier GK104 part. The R9 280 already compares favorably to the GTX 760, so AMD needs only to not regress to maintain their competitiveness. Meanwhile the GTX 760 was until recently frequently found at $239 – a hair under the R9 285’s launch price – and has since fallen to around $219 in response to the R9 285. What this means is that the GTX 760 has slowly withdrawn itself from competition, taking up a position as a lower performance but cheaper card. It's still NVIDIA's closest competitor at this time, but NVIDIA has wisely realized that they can find a more comfortable spot below the R9 285 rather than trying to compete head-on with it.

The launch of the R9 285 has been a hard launch, and with AMD’s partners producing their own designs this is a pure virtual launch (no reference card) with an MSRP of $249. In our briefing AMD also told us that there will be both 2GB and 4GB cards, and from past experience with split launches like these, we’re expecting most cards to be of the 2GB variety. In fact of the first wave of cards that have hit the market, all of them are 2GB cards with 4GB cards yet to reach shelves. Partially due to this lag between 2GB and 4GB parts, AMD hasn’t been able to give us an estimate on what the 4GB price premium is, but it’s going to be an important fact to take into consideration as the suitability of 2GB enthusiast cards has been challenged by the presence of so much RAM on the current-generation consoles, which will have a knock-on effect on console-to-PC ports.

Meanwhile with the launch of the R9 285 and impending discontinuation of the R9 280, buyers looking at picking up an R9 285 in the near term will have to be on the lookout for R9 280 on clearance sale. It’s already regularly found for $220 and lower, making it $30+ cheaper than the R9 285 and possessing 3GB of VRAM to the R9 285’s 2GB. This will make the R9 280 a strong contender, at least until supplies run out.

Finally, coinciding with the launch of the R9 285 will be a refresh of AMD’s Never Settle bundles. At the gold tier, which will encompass the entire R9 series, AMD is adding Alien: Isolation, and atypically a feature-limited (non-full) copy of Star Citizen to the lineup.

Fall 2014 GPU Pricing Comparison
AMD Price NVIDIA
Radeon R9 290 $400  
  $310 GeForce GTX 770
Radeon R9 280X $280  
Radeon R9 285 $250  
Radeon R9 280 $220 GeForce GTX 760
Radeon R9 270X $180  
  $160 GeForce GTX 660

 

Tonga’s Microarchitecture – What We’re Calling GCN 1.2
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  • felaki - Wednesday, September 10, 2014 - link

    The article says that the Sapphire card has "1x DL-DVI-I, 1x DL-DVI-D, 1x HDMI, and 1x DisplayPort". Can you be more precise as to which versions of the spec are supported? Is it HDMI 1.4 or HDMI 2.0? I believe since this refers to MST, it's only HDMI 1.4 and a DisplayPort connection is required in MST mode for 4K@60Hz output?

    Reading the recent GPU articles, I'm very puzzled why HDMI 2.0 adoption is still lacking in GPUs and displays, even though the spec has been out there for about a year now. Is the PC industry reluctant to adopt HDMI 2.0 for some (political(?), business(?)) reason? I have heard only bad things about DisplayPort 1.2 MST to carry a 4K@60Hz signal, and I'm thinking it's a buggy hack for a transitional tech period.

    If the AMD newest next-gen graphics card only supports HDMI 1.4, that is mind-boggling. Please tell me I'm confused and this is a HDMI 2.0-capable release?
    Reply
  • Ryan Smith - Wednesday, September 10, 2014 - link

    DisplayPort 1.2 and HDMI 1.4. Tonga does not add new I/O options. Reply
  • felaki - Wednesday, September 10, 2014 - link

    Thanks for clarifying this! Reply
  • Penti - Wednesday, September 10, 2014 - link

    You can do 4K SST on both Nvidia and AMD-cards as long as they are DisplayPort 1.2 capable. It depends on your screen. There is no HDMI 600MHz on any graphics processor. Neither is their much of support from monitors or TVs as most don't do 600MHz. Reply
  • felaki - Wednesday, September 10, 2014 - link

    Thanks! I was not actually aware that SST existed. I see here http://community.amd.com/community/amd-blogs/amd-g... that AMD is referring to SST as being the thing to fix up the 4K issue, although the people in the comments on that link refer that the setup is not working properly.

    How do people generally see SST? Should one defer buying a new system now until proper HDMI 2.0 support comes along, or is SST+DisplayPort 1.2 already a glitch-free user experience for 4K@60Hz?
    Reply
  • Kjella - Wednesday, September 10, 2014 - link

    Got 3840x2160x60Hz using SST/DP and it's been fine, except UHD gaming is trying to kill my graphics card. Reply
  • mczak - Wednesday, September 10, 2014 - link

    DP SST 4k/60Hz should be every bit as glitch free as proper hdmi 2.0 (be careful though with the latter since some 4k TVs claiming to accept 60Hz 4k resolutions over hdmi will only do so with ycbcr 4:2:0). DP SST has the advantage that actually even "old" gear on the graphic card side can do it (such as radeons from the HD 6xxx series - from the hw side, if it could do DP MST 4k/60Hz it should most likely be able to do the same with SST too, the reason why MST hack was needed in the first place is entirely on the display side).
    But if you're planning to attach your 4k TV to your graphic card a DP port might not be of much use since very few TVs have that.
    Reply
  • Solid State Brain - Wednesday, September 10, 2014 - link

    I won't get another AMD video card until idle multimonitor consumption gets fixed. According to other websites, power consumption in such case increases substantially whereas NVidia video cards have almost the same consumption as when using a single display. In the case of the Sapphire 285 Dual-X it increases by almost 30W just by having a second display connected!!

    I think Anandtech should start measuring idle power consumption when more than one display is connected to the video card / multimonitor configurations. It's an important information for many users who not only game but also need to have productivity needs.
    Reply
  • Solid State Brain - Wednesday, September 10, 2014 - link

    And of course, a comment editing function would be useful too. Reply
  • shing3232 - Wednesday, September 10, 2014 - link

    well, AMD video card have to run higher frequency with multiscreen than with a single monitor Reply

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