On the 27'' 5K iMac what is the performance difference between the AMD Radeon R9 M380 2GB and the AMD Radeon R9 M390 2GB? It's going to be used for video games mostly, will their even be much of a difference?
MacBook Pro with Retina display, iOS 9.0.2
Here is a full list of specifications from AMD's website:
The differences are highlighted like this with a ℹ symbol.
As far as performance goes, I have the exact same question. Personally, I wouldn't know, but hope this can give a little idea.
| R9 390X | R9 390 | R9 380 | |
|---|---|---|---|
| GPU ARCHITECTURE | 28nm | 28nm | 28nm |
| API SUPPORT6,7,8 | DirectX® 12, Mantle, OpenGL® 4.58, Vulkan™, OpenCL™ 2.0 | DirectX® 12, Mantle, OpenGL® 4.58, Vulkan™, OpenCL™ 2.0 | DirectX® 12, Mantle, OpenGL® 4.58, Vulkan™, OpenCL™ 2.0 |
| HIGH-BANDWIDTH MEMORY1(HBM) | No | No | No |
| PCI EXPRESS® VERSION17 | 3.0 | 3.0 | 3.0 |
| VIRTUAL SUPER RESOLUTION (VSR)4 | Yes | Yes | Yes |
| AMD FREESYNC™ TECHNOLOGY5 | Yes | Yes | Yes |
| AMD LIQUIDVR™ TECHNOLOGY9 | Yes | Yes | Yes |
| 4K RESOLUTION SUPPORT3 | Yes | Yes | Yes |
| FRAME RATE TARGET CONTROL (FRTC)11 | Yes | Yes | Yes |
| DDMA AUDIO | Yes | Yes | Yes |
| HDMI (WITH 4K, STEREO 3D, DEEP COLOR & X.V.COLOR™) | Yes | Yes | Yes |
| AMD POWERTUNE TECHNOLOGY13 | Yes | Yes | Yes |
| AMD ZEROCORE POWER TECHNOLOGY13 | Yes | Yes | Yes |
| AMD TRUEAUDIO TECHNOLOGY15 | Yes | Yes | Yes |
| AMD EYEFINITY TECHNOLOGY10 (MAXIMUM DISPLAYS) | Up to 6 displays with DisplayPort MST hub | Up to 6 displays with DisplayPort MST hub | Up to 6 displays with DisplayPort MST hub |
| AMD HD3D TECHNOLOGY18 | Yes | Yes | Yes |
| VIDEO CODEC ENGINE (VCE) (WITH H.264, MPEG-4 ASP, MPEG-2, VC-1 & BLU-RAY 3D) | Yes | Yes | Yes |
| ℹ GPU CLOCK SPEED | Up to 1050 MHz | Up to 1000 MHz | Up to 970 MHz |
| ℹ MEMORY BANDWIDTH | 384 GB/s | 384 GB/s | 182.4 GB/s |
| ℹ MEMORY INTERFACE | 512-bit GDDR5 | 512-bit GDDR5 | 256-bit GDDR5 |
| ℹ MEMORY AMOUNT | 8GB GDDR5 | 8GB GDDR5 | Up to 4GB GDDR5 |
| ℹ STREAM PROCESSING UNITS | 2816 (44 Compute Units)19 |
2560 (40 Compute Units)19 |
1792 (28 Compute Units)19 |
| ℹ REQUIRED POWER SUPPLY CONNECTORS | 1 x 6-pin, 1 x 8-pin | 1 x 6-pin, 1 x 8-pin | 2 x 6-pin |
| ℹ AMD CROSSFIRE™ SUPPORT12 (MAXIMUM NUMBER OF GPUS AND CROSSFIRE BRIDGE INTERCONNECT REQUIRED) | 4, no | 4, no | 2, no |
| FORM FACTOR | Full height, dual slot | Full height, dual slot | Full height, dual slot |
I think the iMac 27" uses the laptop versions R9 M380 and M390 (note the M), so the above values might not apply.
27'' 5K iMac what is the performance difference between the AMD Radeon R9 M380 and the R9 M390?
