AMD unveils Radeon Pro 450, Pro 455 and Pro 460 for Macbook Pro

When Apple announced a whole new generation of Macbook Pro, it was not just the design that was new. The larger 15-inch variant also came out first with AMD’s new Radeon Pro for laptops. These are the Radeon Pro 450, Pro 455 and Pro 460, all of which are based on the Polaris architecture and the Polaris 11 circuit.

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1 Specifications: AMD Radeon Pro 460, Pro 455 and Pro 450

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Specifications: AMD Radeon Pro 460, Pro 455 and Pro 450

	Pro 460	Pro 455	Pro 450	RX 460 (desktop)
Technical	14 nm Samsung	14 nm Samsung	14 nm Samsung	14 nm Samsung
Circuit	Polaris 11	Polaris 11	Polaris 11	Polaris 11
Architecture	GCN 4.0	GCN 4.0	GCN 4.0	GCN 4.0
Streamprocessorer	1 024 st.	768 st.	640 st.	896 st.
Texture units	64 st.	48 st.	40 st.	56 st.
Raster units	16 st.	16 st.	16 st.	16 st.
Clock frequency	–	–	–	1 090 MHz
GPU Boost	908 MHz*	846 MHz*	781 MHz*	1 200 MHz
Computational power	1 860 GFLOPS	1 300 GFLOPS	1 000 GFLOPS	2 150 GFLOPS
Memory bus	128-bit	128-bit	128-bit	128-bit
Memory amount	4 GB GDDR5	2 GB GDDR5	2 GB GDDR5	2/4 GB GDDR5
Memory frequency	5 000 MHz	5 600 MHz	5 000 MHz	7 000 MHz
Memory bandwidth	80 GB/s	80 GB/s	80 GB/s	112 GB/s
TBP	<35 W	<35 W	<35 W	<75 W

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* Estimated values based on AMD’s stated floating point performance (GFLOPS).

Even though it’s the same graphics circuit, the trio differs a lot in terms of performance, as they all have their own variant of the Polaris 11. Only the Radeon Pro 460 has the full-scale variant with 1,024 stream processors, something not even the desktop graphics card Radeon RX 460 can be proud of.

The theoretical computing power is set at 1,860 GFLOPS for the Radeon Pro 460, which reveals a clock frequency of just over 900 MHz. This includes 4 GB of GDDR5 in relatively low clocked 5,000 MHz. Together, this means that AMD has been able to reduce the specified power consumption to below 35 W.

Another thing AMD highlights that will make the Polaris 11 more interesting for laptops, and what may have been a factor that came into play when Apple chose graphics cards for the new Macbook Pro, is that the graphics circuit is physically thinner through a process called “Die thinning” or “Wafer backgrinding”.

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What this means is that when a silicon wafer with uncut Polaris 11 is finished, it is ground down from 780 to 380 micrometers (0.38 millimeters). This means that the graphics circuit is well suited for thinner computers, as these can either be slimmed down more or get a little more space for other things.