1.    16 Jan 2016 #1
    Join Date : Oct 2015
    UK
    Posts : 21
    Windows 10

    Why does R9 380 perform worse than R9 280X?


    PC1
    PSU: BeQuiet Pure Power L7 530W
    Mobo: Gigabyte Z68MA-D2H
    Processor: Intel Core i5-2500K 3.30GHz (Sandybridge)
    Memory: G.Skill RipJawsX 8GB (2x4GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit
    GPU: Sapphire AMD Radeon R9 280X DUAL-X
    OS: Windows 10


    PC2
    PSU: Cougar STX 650W 80 Plus Corsair 430W V2 CX Series PSU
    Mobo: Asrock A75M-HVS P1.80
    Processor: AMD Llano A6-3650 2.60GHz Socket FM1
    Memory: Corsair Vengeance 8GB (2x4GB) DDR3 1866Mhz Memory Kit CL9 1.5V
    GPU: XFX Radeon R9 380 4GB
    OS: Windows 10


    I ran the unigine valley benchmark for both PCs. Results:

    PC1 (with R9 280X)
    FPS: 67.1
    Score: 2806

    PC2 (with R9 380)
    FPS: 40.1
    Score: 1680


    PC2 is bottlenecked by the CPU/mobo, I think. So I swapped the GPUs over in the PCs and here are the new results:

    PC1 (with R9 380):
    FPS: 63.1
    Score: 2642


    PC2 (with R9 280X):
    FPS: 40.5
    Score: 1696


    I expected PC1 with the R9 380 to be much better than all the tests, but it wasn't, it was slower than the R9 280X. I was not surprised that the R9 380 in PC2 was no better than the R9 280 because it's being bottlenecked. Any ideas on why the R9 380 is so underwhelming?
      My ComputerSystem Spec
  2.    16 Jan 2016 #2
    Join Date : Jun 2015
    N.Y.
    Posts : 3,069
    Windows 10 Pro 64 bit

    Maybe it's that PC2 has a lesser processor then PC1
      My ComputerSystem Spec
  3.    16 Jan 2016 #3
    Join Date : Oct 2015
    UK
    Posts : 21
    Windows 10
    Thread Starter

    Quote Originally Posted by jds63 View Post
    Maybe it's that PC2 has a lesser processor then PC1
    It's true it does, but it doesn't make sense. Why doesn't the 380 really shine when put in PC1?
      My ComputerSystem Spec
  4.    16 Jan 2016 #4
    Join Date : Jun 2015
    N.Y.
    Posts : 3,069
    Windows 10 Pro 64 bit

    Quote Originally Posted by chewlip View Post
    It's true it does, but it doesn't make sense. Why doesn't the 380 really shine when put in PC1?
    I do not know the cards well, as said Intel Processor is bit better then the other AMD, is my educated guess without looking into other hardware in each like the motherboard and benchmark of these cards.
      My ComputerSystem Spec
  5.    16 Jan 2016 #5
    Join Date : May 2015
    Posts : 1,647
    Win 10 X64 Pro 15063

    I have no personal familiarity with the cards.

    Here's one set of benchmarks:

    GPU 2015 Benchmarks - Compare Products on AnandTech

    Here is a description of their hardware:

    The AMD Radeon R9 380X Review, Feat. ASUS STRIX

    The main obvious superiority of the 280x is that it has more VRAM and a 384 bit path to it. Given the similar memory clocks, it would have more than 1.5X the memory bandwidth of the 380.

    You may have the false impression that a newer card must be superior to an older one.
      My ComputerSystem Spec
  6.    16 Jan 2016 #6
    Join Date : Jan 2016
    Posts : 10
    Windows xp windows 7 windows 10

    The difference in fps is only 4 with with PC1...Wait for driver updates and r9 380 will improve performance over time.Which drivers are you using? Crimson or old ccatalyst drivers???
      My ComputerSystem Spec
  7.    18 Jan 2016 #7
    Join Date : Jul 2014
    Serbia
    Posts : 10,634
    W10 Insider + Linux

    280 and 380 are not that far apart performance wise and 280 with "X" is factory OCed.
    While gaming, check how much are CPU and GPU utilized, that will give you results to compare CPU and GPU "power".
    On second system, processor is probably hitting close to 100% and that would indicate a bottleneck. Turning off IGPU and OCing processor a bit may help.
      My ComputersSystem Spec

 


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