Over the second-half of this year, AMD has been gearing up to cascade their latest Radeon graphics architecture to successively cheaper and more mainstream products. Last month we saw the announcement of the mid-tier Radeon RX 5500 and RX 5500M series for desktop and mobile respectively. And now this morning the company is adding a third tier of Radeon mobile discrete graphics to their lineup, with the addition of the Radeon RX 5300M series.

Revealed alongside today’s 16-inch MacBook Pro announcement – with Apple once again getting their own exclusive Radeon Pro SKUs – the 5300M represents the further proliferation of AMD’s Radeon RDNA architecture. Based on AMD’s Navi 14 GPU, AMD is tapping their (currently) smallest Navi chip to offer a lower performing and presumably lower priced graphics adapter for laptop use.

AMD Radeon RX Series Mobile Specification Comparison
  AMD Radeon RX 5300M AMD Radeon RX 5500M AMD Radeon Vega Pro 20 AMD Radeon RX 560X
CUs 22 22 20 14/16
Texture Units 88 88 80 64
ROPs 32 32 32 16
Game Clock 1181MHz 1448MHz N/A N/A
Boost Clock 1445MHz 1645MHz 1300MHz 1275MHz
Throughput (FP32) 4.1 TFLOPs 4.6 TFLOPs 3.3 TFLOPs 2.6 TFLOPs
Memory Clock 14 Gbps GDDR6 14 Gbps GDDR6 1.5 Gbps HBM2 7 Gbps GDDR5
Memory Bus Width 96-bit 128-bit 1024-bit 128-bit
Max VRAM 3GB 4GB 4GB 4GB
Typical Board Power ? 85W ? ?
Architecture RDNA (1) RDNA (1) Vega
(GCN 5)
GCN 4
GPU Navi 14 Navi 14 Vega 12 Polaris 11
Launch Date Q4 2019 Q4 2019 10/2018 04/2018

At a high level, the 5300M is a further cut down version of Navi 14. AMD has held the number of CUs constant at 22 (which was already a cut-down amount from a full chip), and instead they’ve cut the memory bus instead. By disabling one of the 4 memory partitions, the resulting chip ends up with a 96-bit GDDR6 memory bus, and a proportional drop in memory bandwidth. The end result is that the 5300M gets a maximum of 168GB/sec of memory bandwidth, down from 224GB/sec in 5500M. This also limits the card to 3GB of VRAM, further differentiating the 5300M from the 5500M, and lowering the total bill of materials costs for OEMs.

Otherwise, while the processing core of the GPU hasn’t been cut back further in terms of hardware, the 5300M does ship with noticeably lower clocks. The game clock for the new adapter is just 1181MHz, 267Mhz lower than on the 5500M. The net result is that, on paper, shading, texturing, compute, and ROP performance should all be around 82% of 5500M’s performance, not counting the hit from the reduced memory bandwidth.

Meanwhile, AMD unfortunately isn’t disclosing TDPs for the new mobile part. So it’s not clear how much lower (if at all) the power consumption of the 5300M is. The drop in clockspeeds as well as the narrower memory bus should help to reduce power consumption, however there’s a wildcard in how much AMD needs to bin for power for their mobile parts.

At any rate, like the Radeon RX 5500M series, the Radeon RX 5300M is officially launching this quarter. With Apple seemingly having first dibs on the Navi 14 silicon, expect to see it show up in other laptops soon.

Source: AMD

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  • yeeeeman - Wednesday, November 13, 2019 - link

    Too bad memory clocks are already pretty high at 14gbps, since with a huge memory overclock it could catch up with the 5500m. Reply
  • EliteRetard - Wednesday, November 13, 2019 - link

    To bad this 5300m isn't more like the one Apple is using, which has the full 128bit and only loses 2CU. I'd rather lose 10% of the processing hardware than 25% of the bandwidth and VRAM.

    Since Nvidia has pretty much been the default mobile GPU, I wonder where the 5300M competes. If it's worse than the mobile 1050 3GB (not even 1650) it's really worthless. I was really hoping there wouldn't be anything lower than that in Nvidia's lineup (like they had with the 940MX previously), but then they dropped the MX150 (now MX250).

    If you really need more than IGP performance, then the bare minimum DGPU shouldn't be lower than low end. Personally I feel like the bare minimum VRAM should be 4GB as well, with 1080p being the minimum screen resolution for laptops.
    Reply
  • PeachNCream - Wednesday, November 13, 2019 - link

    One would hope that TDP is lower by quite a bit. The 85W that the RX5500M needs would demand considerable cooling and power making using it without plugging into a wall outlet with a fairly large power supply a difficult prospect. I guess it doesn't really matter much to anyone as long as the RX 5300M remains an Apple only GPU since it will not ship in significant numbers. Reply
  • Cooe - Wednesday, November 13, 2019 - link

    Apple isn't using the RX 5300M.... They are using the completely unrelated Radeon Pro 5300M, which is totally different spec-wise. Reply
  • PeachNCream - Thursday, November 14, 2019 - link

    Oh thanks! I misunderstood that portion of the artcile while reading it the first time around. Reply
  • kpb321 - Wednesday, November 13, 2019 - link

    Are the ROPs count right? Are those usually tied to the memory controller and the number of memory channels? Offhand I'd have expected it to drop down to 24 ROPs. Reply
  • StevoLincolnite - Wednesday, November 13, 2019 - link

    Probably using a crossbar which allows for the mismatch. Reply
  • extide - Wednesday, November 13, 2019 - link

    On Nvidia GPU's yes, they are tied together -- AMD does not have that limitation. Reply
  • casperes1996 - Wednesday, November 13, 2019 - link

    What about the 8GB variant of the 5500M? Reply
  • Cooe - Wednesday, November 13, 2019 - link

    The only mobile Navi 14 part to currently come with an 8GB option is the Radeon Pro 5500M, which is otherwise identical spec-wise to the 4GB model. The RX 5500M is 4GB only atm. Reply

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