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    GT650M DDR3 vs GDDR5 difference tested!

    Discussion in 'Gaming (Software and Graphics Cards)' started by Supranium, May 12, 2012.

  1. dado023

    dado023 Notebook Enthusiast

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    ok, i have done a bit ocing, only memory, from 2000mhz to 26000mhz
    Unigine benchmark settings:
    Code:
    Render:		direct3d11
    Mode:		800x600 8xAA windowed
    Shaders:	high
    Textures:	high
    Filter:		trilinear
    Anisotropy:	16x
    Occlusion:	enabled
    Refraction:	enabled
    Volumetric:	enabled
    Tessellation:	normal
    GPU: 835MHz(default) Shaders: 1600MHz(default) Memory GDDR5:2000MHz (default)
    Results:

    Code:
    FPS:	36.3
    [B]Scores:	913[/B]
    Min FPS:	19.4
    Max FPS:	80.4

    GPU: 835MHz(default) Shaders: 1600MHz(default) Memory GDDR5:2600MHz (oced)


    Code:
    FPS:	37.6
    [B]Scores:	946[/B]
    Min FPS:	20.5
    Max FPS:	85.8
    

    I used msi afterburner to crank up mem to 2600mhz.
    I tried to oc gpu core, but msi afterburner is limiting me to 540mhz, wierd....

    so there you have it, 30% increase of mem freq. results only in 4% performance yield.
    I wish i could oc gpu core to 900mhz, because at these setting temp was below 70C
     
  2. Cakefish

    Cakefish ¯\_(?)_/¯

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    Am I right in thinking that the GDDR5 is only important at high resolutions i.e. 1080p? My new laptop's native res will be 1366x768. Bandwidth isn't as important at this resolution, am I right?
     
  3. nissangtr786

    nissangtr786 Notebook Deity

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    I think gddr5 and 256bit cards are more suited for 1080p but 128bit easily does 720p gaming especially a gt 650m.

    Computer Games on Laptop Graphic Cards - Notebookcheck.net Tech

    Judging from this a gt 650m will play every game you get at 720p at least 30fps and with aa turned down a little most games should play 60fps.
     
  4. R3d

    R3d Notebook Virtuoso

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    Right. Assuming all other settings are the same, higher resolution = higher bandwidth usage.
     
  5. Meaker@Sager

    Meaker@Sager Company Representative

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    Good to know 800x600 is not bandwdth limited by ddr3 *facepalm* i think we figured that out back in the 9800pro/5900ultra days.
     
  6. dado023

    dado023 Notebook Enthusiast

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    Doing benchmark on FullHD while performing 10fps doesn't make any sense either, so maxed values like 8xAA and Anisotropy 16x impact bandwidth in adequate way for this kind of benchmark software.
    Instead of writing *facepalm* comments, you could contribute with a valid suggestion how to improve testing, so all community would benefit.
     
  7. Genoskia

    Genoskia Notebook Guru

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    Unfortunately I'm with the guy above your post... 800x600 isn't a great resolution to bench memory..... that doesn't mean your wrong though how about you prove what you just said to us as I'm very interested...

    Please do another test with AA and Anisotropy off at same Res then two at a higher resolution (720 or 1080p) with AA/anisotropy on/off so we can be the judge of what really affects memory bandwidth.
     
  8. Hodor

    Hodor Notebook Geek

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    I am sorry if that has already been answered but I somewhere read that the GDDR3 version of the GT650M needs more power for the memory than the GDDR5 version. So, is that true and how much warmer will the GDDR3 version get compared to the GDDR5 version?
     
  9. R3d

    R3d Notebook Virtuoso

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    No. If anything, it needs less power.
     
  10. Tinderbox (UK)

    Tinderbox (UK) BAKED BEAN KING

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  11. Supranium

    Supranium Notebook Evangelist

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    Yes, (G)DDR3 consumes equal or less power compared to GDD5. Power consumption primaly depens on which manufacturing process the chips are made on. 32nm consumes more power than 22nm and so on.
     
  12. STIMjim

    STIMjim Notebook Enthusiast

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    Okay, so are we in agreement that the GT 650M GDDR5 is best for 1080p and for resolutions lower than that the DDR3 memory would be a better option, for the price?
     
  13. R3d

    R3d Notebook Virtuoso

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    gddr5 would be better for anything >900p, imo.
     
  14. HTWingNut

    HTWingNut Potato

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    DDR3 isn't better for anything, it just won't be as much of a bottleneck at 720p/768p.
     
  15. jaug1337

    jaug1337 de_dust2

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    This thread summed up
     
  16. Tinderbox (UK)

    Tinderbox (UK) BAKED BEAN KING

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  17. TheMrPatrick

    TheMrPatrick Newbie

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    I am currently interested in a cheap laptop with a GT650M, only downside, it has GDDR3 memory. It's a Medion with a i7-3610QM and lots of other very good stuff compared to other equally priced laptops. I was planning on playing games like GTA IV. Is GDDR3 really worse for gaming in the native 768 resolution?

    I now notice DDR3 is being discussed, are GDDR3 and DDR3 the same thing?
     
  18. Baenwort

    Baenwort Notebook Evangelist

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    They are not but in this case the difference is a typo as the GPUs don't use ddr3 but rather GDDR3.

    At the native rez of 768p you will not see a difference that is not in the single digit percentages at that rez. The main advantage of GDDR5 is at 900p and higher resolution. If your gaming is typically done on a external monitor you may want a GDDR5 version but on such a low rez display the impact is not great.
     
  19. ollioddi

    ollioddi Newbie

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    How do i know if i got GDDR5 or DDR3? On my laptop ive got a sticker saying Nvidia GeForce gt 650m 2gb...
    But how do i know? :confused:
     
  20. HTWingNut

    HTWingNut Potato

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    What laptop? Use GPU-Z: GPU-Z Video card GPU Information Utility
     
  21. T2050

    T2050 Notebook Deity

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    Just want to point out something where as DDR3 might use less power than GDDR5, then most DDR3 models are usually 2GB, and many GDRR5 model are only 1GB. Wouldn't be fair to say in this instance that DDR3 will use more power, powering larger amount of memory and/or chips?
     
  22. HSanjay19

    HSanjay19 Notebook Guru

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    Sorry to bump but if anyone is still reading this....how would a GT 650M DDR5 compare with a newer 750M DDR3? I mean with 900p or 768p with medium (or high) settings without maxing out everything?
     
  23. sasuke256

    sasuke256 Notebook Deity

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    GDDR5 >>> DDR3, just oc that 650M and you will have MUCH better performance.
     
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