As our long-time readers are keenly aware, the product cycles followed by PC OEMs and ODMs for their laptops and desktops are rarely perfectly in sync with the development cycles of the underlying processors. With a desire to refresh their PCs on a yearly basis – whether or not new processors are available – OEMs lean on their suppliers to come up with newer parts to fill out these devices. Consequently, it has become a semi-annual ritual for the GPU vendors to rebadge parts of their lineups to meet the needs of OEMs, shuffling together old and new parts as part of a continuous cycle of upgrades and replacements.

Kicking off this latest cycle, this week AMD quietly updated the laptop GPU section of their website to add the Radeon M400 series, the latest generation of AMD’s notebook (and AIO desktop) GPUs. And to cut right to the chase, while this year is going to be an important year for AMD with the launch of their Polaris architecture and its accompanying GPUs, Polaris isn’t upon us quite yet. Instead what AMD has published are the customary 28nm rebadges that will be fleshing out the M400 line, presumably positioned around where Polaris will land a bit later this year.

As these product updates aren’t coming alongside any other formal product announcement, there’s little information on AMD’s branding/positioning direction at this time. So the information we have is limited to some basic hardware specifications. Given the timing of this release – just two weeks before Computex – I expect we’ll see more from AMD as part of their annual Computex presentations. In the meantime if you see Radeon M400 parts start to show up in laptop specification sheets ahead of Computex, here is what’s going on under the hood.

AMD R9 M400 Series GPU Specifications
  R9 M485X R9 M470X R9 M470
Was Variant of R9 M395X Variant of R9 M385X Variant of R9 M380
Stream Processors 2048 896 768
Texture Units 128 56 48
ROPs 32 16 16
Memory Clock <= 5Gbps GDDR5 <= 6Gbps GDDR5 <= 6Gbps GDDR5
Memory Bus Width 256-bit 128-bit 128-bit
VRAM <= 8GB <=4GB <=4GB
GPU Tonga Bonaire Bonaire
Manufacturing Process TSMC 28nm TSMC 28nm TSMC 28nm
Architecture GCN 1.2 GCN 1.1 GCN 1.1

The sizable high-performance Radeon R9 M300 family has been trimmed significantly for the R9 M400 family, which at least until the launch of Polaris is composed of three products: M485X, M470X, and M470. The former is identical in specification to R9 M395X, making it a rebadged GCN 1.2 Tonga part with all 2048 SPs enabled. Meanwhile the M470 series follows the M380 series, making it rebadges of the GCN 1.1 Bonaire GPU. M470X would be a fully enabled part with all 896 SPs enabled, while M470 cuts that down to 768 SPs.

Meanwhile, not found here are any parts based on AMD’s venerable GCN 1.0 Pitcairn GPU. After a run of over 4 years, it looks like Pitcairn has set off on a well-deserved retirement.

AMD R7 M400 Series GPU Specifications
  R7 M465X R7 M465 R7 M460 R7 M445 R7 M440
Was Variant of R9 M370 Variant of R7 M370 Variant of R7 M360 Variant of R7 M340 Variant of R7 M340
Stream Processors 512 384 384 320 320
Texture Units 32 24 24 20 20
ROPs 16 8 8? 4? 4?
Memory Clock <= 4.5Gbps GDDR5 <= 4.6Gbps GDDR5 <= 2Gbps DDR3 <= 4Gbps GDDR5 <= 2Gbps DDR3
Memory Bus Width 128-bit 64/128-bit 64-bit 64-bit 64-bit
VRAM <= 4GB <=4GB <=4GB <=4GB <=4GB
GPU Cape Verde Topaz Topaz Topaz Topaz
Manufacturing Process TSMC 28nm TSMC 28nm TSMC 28nm TSMC 28nm TSMC 28nm
Architecture GCN 1.0 GCN 1.2 GCN 1.2 GCN 1.2 GCN 1.2

As for the R7 level of GPUs, AMD is introducing 5 different models. The part that immediately sticks out the most is the 512 SP R7 M465X, which has no immediate predecessor in AMD’s catalog. Based on the limited information here, this looks to be a cut-down version of R9 M370 series, which utilized the GCN 1.0 Cape Verde GPU. This part doesn’t feature all of Cape Verde’s SPs enabled, but does retain the higher bandwidth offered by GDDR5.

Below the M465X things get murkier with the remaining M460 series and M440 series parts. AMD has a number of overlapping parts here, and the underlying configurations are not well documented to the public. The M465 could be multiple parts, but most likely we’re looking at Topaz in two different configurations, with one featuring the full 128-bit memory bus, while another features a neutered 64-bit memory bus. In any case these seem to be rebadges/retools of the R7 M370, meaning we’re looking at 384 SPs with differing amounts of memory bandwidth. The M460 on the other hand looks to be a straight-up rebadge of the M360, another Topaz-esque part with a 64-bit memory bus and DDR3 memory.

Rounding out the R7 collection is the M440 and M445, each of which features 320 SPs. These again are likely Topaz parts, with the published difference being the memory technology. M445 uses GDDR5 on a 64-bit memory bus, while M440 uses DDR3 on the same sized bus. These are essentially rebadges/retools of the R7 M340.

AMD R5 M400 Series GPU Specifications
  R5 M435 R5 M430 R5 M420
Was New Variant of R5 M330 Variant of R5 M320
Stream Processors 320 320 320
Texture Units 20 20 20
ROPs 4? 4? 4?
Memory Clock <= 4Gbps GDDR5 <= 2Gbps DDR3 <= 2Gbps DDR3
Memory Bus Width 64-bit 64-bit 64-bit
VRAM <= 4GB <=4GB <=4GB
GPU Topaz? Topaz? Topaz?
Manufacturing Process TSMC 28nm TSMC 28nm TSMC 28nm
Architecture GCN 1.2 GCN 1.2 GCN 1.2

Finally bringing up the rear are the R5 M400 series. These 320 SP parts are likely candidates to be paired with APUs for dual graphics operation. At the top of the list is the R5 M435, and highly unusual for an R5 part features GDDR5 memory on a 64-bit memory bus. AMD has never offered a 320 SP part with GDDR5 before, so while it’s vaguely similar to the R7 340, it has no real predecessor. Meanwhile the R5 M430 and M420 are almost certainly direct rebadges of the M330 and M320 respectively.

The bigger question of course is where products based on AMD’s forthcoming Polaris GPUs will fit into these lineups. Having undertaken their annual rebadge, at this point it’s safe to assume that the Polaris parts will be sold under the M400 banner as well. And given the performance AMD has been touting, I’m sure we’ll be looking at a fuller R9 M400 lineup once that happens. In the meantime we’ll have to see what AMD has planned for the Radeon Mobility family at Computex.

Source: AMD (via SH SOTN)

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  • Alphasite - Saturday, May 14, 2016 - link

    Out of interest, why do you guys still ever to them as GCN 1.0, 1.1, 1.2, etc? Would it not be more congruent to use AMD's official naming scheme?
  • AS118 - Saturday, May 14, 2016 - link

    That's actually a good point, I know people may be used to that, but going forward, it would cause less confusion, especially when AMD releases its own info.
  • ImSpartacus - Saturday, May 14, 2016 - link

    Maybe they are trying to be consistent with historical terminology? I mean, they used the term "4th gen" GCN in the Polaris reveal article earlier this year, so Ryan is obviously aware of it.
  • Ryan Smith - Saturday, May 14, 2016 - link

    Spartacus is correct. At this point I'm being consistent with existing names; Polaris will be GCN4, reflecting AMD's revised naming.
  • farmergann - Saturday, May 14, 2016 - link

    I'd suggest they also change the m465x to Gen3 GCN as it appears to be a mobile dGPU equivalent of Carrizo's GPU.
  • extide - Saturday, May 14, 2016 - link

    Uhhh, no. They have it labeled correctly. It is not at all a GCN 3 (1.2) part.
  • rtho782 - Saturday, May 14, 2016 - link

    Because this naming makes sense, and AMD are "consistently inconsistent" with their naming, and will (as the article shows) rename the same products for the sake of a higher number.

    With this naming, I know which support freesync, trueaudio, etc.
  • AS118 - Saturday, May 14, 2016 - link

    Well, while I was hoping Polaris would fill up most of the M400 series lineup, I guess this isn't totally unexpected. Similar to when Maxwell was first launching for Nvidia, I guess.
  • ImSpartacus - Saturday, May 14, 2016 - link

    Yeah, I'm surprised that there are so many rebrands on the mobile side. I figured at least the top end stuff would use Polaris. I mean, Polaris 10 could surely be reined in to 100W MXM-B gaming stuff and Polaris 11 could definitely fit into 50W MXM-A as well as most mid-range discrete stuff.
  • extide - Saturday, May 14, 2016 - link

    Polaris 10 will be in the R9 M490/x (or possibly 495) series, and Polaris 11 will be the M480/x. You can see they slot in nicely right there.

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