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Thread: Why is the HD5830 slower than the HD4890??

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    Moosing about! CAT-THE-FIFTH's Avatar
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    Why is the HD5830 slower than the HD4890??

    I have had a quick look at some of the reviews of the HD5830 and it seems to be slower than an HD4890 1GB!! I know it has a core which is clocked 50MHZ lower but in all other specifications it is better. I assume it could be due to drivers but then the HD5850 and HD5870 have been out of ages so in theory this should not be the case.

    The pricing also seems laughable. I am getting a bit of Deja Vu here as when the HD4830 was originally launched it was near the price of the HD4850 and subsequently the HD4850 prices went up!!

    I hope ATI are not trying to do the same thing with the HD5830 and HD5850!!

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    Headless Chicken Terbinator's Avatar
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    Re: Why is the HD5830 slower than the HD4890??

    Why? Because underwhelming card is underwhelming.
    Kalniel: "Nice review Tarinder - would it be possible to get a picture of the case when the components are installed (with the side off obviously)?"
    CAT-THE-FIFTH: "The Antec 300 is a case which has an understated and clean appearance which many people like. Not everyone is into e-peen looking computers which look like a cross between the imagination of a hyperactive 10 year old and a Frog."
    TKPeters: "Off to AVForum better Deal - £20+Vat for Free Shipping @ Scan"
    for all intents it seems to be the same card minus some gays name on it and a shielded cover ? with OEM added to it - GoNz0.

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    Moosing about! CAT-THE-FIFTH's Avatar
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    Re: Why is the HD5830 slower than the HD4890??

    Quote Originally Posted by Terbinator View Post
    Why? Because underwhelming card is underwhelming.
    ???? Still does explain why though!

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    Banhammer in peace PeterB kalniel's Avatar
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    Re: Why is the HD5830 slower than the HD4890??

    I thought this had already been explained.

    Fixed function is nearly always faster than flexible function.

    DX11 has a far more flexible computational component, and clock for clock the DX11 shaders in ATI cards are going to be slower (in terms of work done) than the DX10 shaders. You get around this by either having more shaders, or clocking them faster.

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    root Member DanceswithUnix's Avatar
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    Re: Why is the HD5830 slower than the HD4890??

    Not quite the same resources though, in that the 4890 was intended to have 16 ROPS whereas the 5830 is reduced (castrated?) down to that level. Perhaps the design is now so far from the configuration it was originally tuned for that it simply doesn't work so well any more. In some of the benchmarks it is a *long* drop down from the 5850.

    If tuning these things was simple, then even Intel would be able to do it with Larabee

    Lets hope as yields improve they produce the chip we always wanted, 5840 anyone?

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    root Member DanceswithUnix's Avatar
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    Re: Why is the HD5830 slower than the HD4890??

    Similar vein, the 5770 is exactly half of a 5870 according to the spec, and yet in Far Cry 2 a pair of 5770 in CF is faster than a 5870. Cheaper too!

    http://www.anandtech.com/video/showdoc.aspx?i=3658&p=6

    Funny old world eh?

    (and yes, I know in other benchmarks they are slower, this one just interested me).

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    Re: Why is the HD5830 slower than the HD4890??

    not impressed at all, esp as the only one scan have is the xfx one @ the best part of £190+vat making it £215 http://www.scan.co.uk/Shop/Computer-...n-HD5830-PCI-E
    right in the firing line of the 5850, it's only £10 cheaper than the sapphire 5850 http://www.scan.co.uk/Products/1GB-S...DMI-plus-Dirt2


    so either save a bit more and get a 5850 (can't justify the price for a 5870) or look at the msi hawk 5770 which is best part of £70 cheaper (and easier to get past the wife )

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    Re: Why is the HD5830 slower than the HD4890??

    Quote Originally Posted by SuicidaL View Post
    so either save a bit more and get a 5850 (can't justify the price for a 5870) or look at the msi hawk 5770 which is best part of £70 cheaper (and easier to get past the wife )

    Or wait a bit

    Fermi in a month, HD5xxx prices will start to fall and you can keep checking sites for special offers in the mean-time.

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    Re: Why is the HD5830 slower than the HD4890??

    also not just the total streams but how they are broken up into clusters,
    The 58xx has a break down of 80streams and 4texture units per cluster, the 48xx used blocks of 80streams and 4texture address+4texture fill units.
    There's a key difference right there, granted the 5830 has 14clusters over the 4890 10clusters however those 10 clusters are running at a higher speed.

    This shows there's some intresting things going on in the background.
    The way nvidia cards, although the gpu design is different in the way it's broken up into groups of clusters, can get equal results with far fewer total streams, however the higher "shader" clock speed seem to make up for this loss.

    This would point to higher speed creates more through put than more clusters of streams.
    But while that would show that the 5830 is slower than the 4890, the fact that the 5850 is faster than both but with a lower clock speed throws up issues.
    My only guess is there's some major miss ballance within the 5830 which is causing a major bottle neck and impacting the performance.
    Well, at least if I go much deeper into the hardware functioning behind the gou's my brain will start leaking out of my ears

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