Overclocking: Gaming & Compute Performance

As always we’ll keep the commentary thin here, but overall the overclocked performance of the 7800s looks very good, which is what you’d expect with a 15%+ core overclock and a 12% memory overclock. With the exception of Skyrim performance at 19x12, the overclocking performance increase for both cards is roughly split between the core and memory overclocks, meaning we’re seeing a 13.5% average performance increase for the 7870 and a 17% average performance increase for the 7850. As the 7800 series has the same number of ROPS as the 7900 series, it looks like we’re running headlong into the memory bandwidth bottleneck that makes the 384-bit memory bus on the 7900 series sing.

All things considered among our tests we have everything from even the 7850OC beating the GTX 580, to the GTX 580 still holding onto its lead versus the 7870OC. But even if you can’t beat a GTX 580 with a 7870OC you can get very close on a card that costs a good bit less.

Meanwhile for compute performance the gains are similar: 12.5% on the 7870, and 19.5% on the 7850.

Overclocking: Power, Temp, & Noise Final Words
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  • mak360 - Monday, March 05, 2012 - link

    Enjoy, now go and buy Reply
  • ImSpartacus - Monday, March 05, 2012 - link

    Yeah, I'm trying to figure out if a 7850 could go in an Alienware X51. It looks like it uses a 6 pin power connector and puts out 150W of heat.

    While we would lose Optimus, would it work?
    Reply
  • taltamir - Monday, March 05, 2012 - link

    optimus is laptops only. You do not have optimus with your desktop. Reply
  • ImSpartacus - Monday, March 05, 2012 - link

    The X51 has desktop Optimus.

    "The icing on the graphics cake is that the X51 is the first instance of desktop Optimus we've seen. That's right: you can actually plug your monitor into the IGP's HDMI port and the tower will power down the GPU when it's not in use. This implementation functions just like the notebook version does, and it's a welcome addition."

    http://www.anandtech.com/show/5543/alienware-x51-t...

    In reality, if I owned an X51, I would wait so I could shove the biggest 150W Kepler GPU in there for some real gaming.

    But I'm sure the X51 will be updated for Kepler and Ivy Bridge, so now wouldn't be the best time to get an X51.

    Waiting games are lame...
    Reply
  • scook9 - Monday, March 05, 2012 - link

    Wrong. Read a review.....The bigger issue will be the orientation of the PCIe Power Connector I expect. I have a tightly spaced HTPC that currently uses a GTX 570 HD from EVGA because it was the best card I could fit in the Antec Fusion enclosure. If the PCIe power plugs were facing out the side of the card and not the back I would have not been able to use it. I expect the same consideration will apply to the even smaller X51 Reply
  • kungfujedis - Monday, March 05, 2012 - link

    he does. x51 is a desktop with optimus.

    http://www.theverge.com/2012/2/3/2768359/alienware...
    Reply
  • Samus - Monday, March 05, 2012 - link

    EA really screwed AMD over with Battlefield 3. There's basically no reason to consider a Radeon card if you plan on heavily playing BF3, especially since most other games like Skyrim, Star Wars, Rage, etc, all run excellent on any $200+ card, with anything $300+ being simply overkill.

    The obvious best card for Battlefield 3 is a Geforce GTX 560 TI 448 Cores for $250-$280, basically identical in performance to the GTX570 in BF3. Even those on a budget would be better served with a low-end GTX560 series card unless you run resolutions above 1920x1200.

    If I were AMD, I'd concentrate on increasing Battlefield 3 performance with driver tweaks, because it's obvious their architecture is superior to nVidia's, but these 'exclusive' titles are tainted.
    Reply
  • kn00tcn - Monday, March 05, 2012 - link

    screwed how? only the 7850 is slightly lagging behind, & historically BC2 was consistently a little faster on nv

    also BF3 has a large consistent boost since feb14 drivers (there was another boost sometime in december, benchmark3d should have the info for both)
    Reply
  • chizow - Tuesday, March 06, 2012 - link

    @ Samus

    BF3 isn't an Nvidia "exclusive", they made sure to remain vendor agnostic and participate in both IHV's vendor programs. No pointing the finger and crying foul on this game, it just runs better on Nvidia hardware but I do agree it should be running better than it does on this new gen of AMD hardware.

    http://www.amd4u.com/freebattlefield3/
    http://sites.amd.com/us/game/games/Pages/battlefie...
    Reply
  • CeriseCogburn - Monday, March 26, 2012 - link

    In the reviews here SHOGUN 2 total war is said to be the very hardest on hardware, and Nvidia wins that - all the way to the top.
    --
    So on the most difficult game, Nvidia wins.
    Certainly other factors are at play on these amd favored games like C1 and M2033 and other amd optimized games.
    --
    Once again, on the MOST DIFFICULT to render Nvidia has won.
    Reply

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