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Thread: New GPU - Performance limited?

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    Question New GPU - Performance limited?

    Hey,

    Can anyone tell me what would happen to the performance of a PCI-e 2.1 graphics card if it's being used in a version 1.0 slot?

    For example what sort of performance would I get from a '1GB XFX HD 5670, PCI-E 2.1 (x16), 4000MHz, GDDR5, GPU 775MHz' if being used in a 1.0 slot?

    As I'm looking for a card to replace my '512mb 7950GT' but I'm not quite ready to buy a new motherboard and upgrade my whole system just yet.



    Thanks for any info/help.......

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    Re: New GPU - Performance limited?

    This article will help:

    http://www.techpowerup.com/reviews/A...press_Scaling/

    A PCI-E 2.0 4X is equivalent to a PCI-E 1.0 8X slot.

    My 975X motherboard runs its PCI-E 1.0 slots at 8X and with an HD4830 there is no reduction in performance AFAIK!!

    Hence,the HD5670 should be fine as long as you have a PCI-E 1.0 8X or 16X slot IMHO.

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    Re: New GPU - Performance limited?

    Thanks for the link and the info Cat-the-fifth..........

    What are your thoughts on the HD5670? Do you think it's the best single slot card around in the price range of £70-85?

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    Re: New GPU - Performance limited?

    Quote Originally Posted by Alek View Post
    Thanks for the link and the info Cat-the-fifth..........

    What are your thoughts on the HD5670? Do you think it's the best single slot card around in the price range of £70-85?
    There are also the bus powered versions of the 9800GT:

    http://www.ebuyer.com/product/177265

    http://www.cclonline.com/product-inf...zt-98ges3g-fsl

    http://www.play.com/PC/PCs/4-/130699...d/Product.html

    This review compares the HD5670 and the standard 9800GT:

    http://www.tomshardware.com/reviews/...5670,2533.html

    The bus powered 9800GT cards have a core clocked at 50MHZ lower,the shaders which are clocked 100MHZ lower and have slower clocked RAM than the 9800GT in the review.

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    Re: New GPU - Performance limited?

    If you don't mind 2nd hand look around for an ati 4770 or 4830
    or 8800gt, 9800gt, 8800gts 512mb

    Although the "eco" versions of the 9800gt are very good for the price.

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    Re: New GPU - Performance limited?

    Quote Originally Posted by CAT-THE-FIFTH View Post
    There are also the bus powered versions of the 9800GT
    My knowledge on GPU's is not that up to date as the last card I bought was a 7950GT and that was pretty powerful at the time lol. I'm finding it hard to understand how for example a 9800GT is better than a HD 5670??

    When the 9800GT specifications are 1GB, PCI-E 2.0 (x16), 1800MHz GDDR3, GPU 600MHz, 112 Cores, DVI-I/HDTV.

    And the 5670 has 1GB, PCI-E 2.1 (x16), 4000MHz, GDDR5, GPU 775MHz, 400 Cores, DP/ DL DVI-I/ HDMI.

    How is the 9800GT getting better gaming performance then the 5670; when the 5670 has faster memory and core speed?

    I'm unsure on which single slot card would be best for a maximum budget of £85..... (looking to buy in the next couple of months)

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    Re: New GPU - Performance limited?

    That's to do with the different way the two cards work to acheive the same result. Basically, both cards have a "core" processor and "shaders" - the core decides what needs doing, and the shaders do the grunt work of generating, colouring and shading the pixels. NVidia run their core and shaders at different speeds, so while ATI run everything at the same speed. To complicate matters, NVidia's shaders also do more calculations than ATIs, so NVidia cards have far less shaders than ATI cards (the 9800GT has 128, while the 5670 has 400!). The same applies to memory - the NVidia card uses a wider memory path, so while the memory runs at a slower clock speed it moves more data with each transfer.

    The only way to actually compare the performance of two cards using such different approaches is to benchmark them running a variety of applications.

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    Re: New GPU - Performance limited?

    Quote Originally Posted by scaryjim View Post
    That's to do with the different way the two cards work to acheive the same result. Basically, both cards have a "core" processor and "shaders" - the core decides what needs doing, and the shaders do the grunt work of generating, colouring and shading the pixels. NVidia run their core and shaders at different speeds, so while ATI run everything at the same speed. To complicate matters, NVidia's shaders also do more calculations than ATIs, so NVidia cards have far less shaders than ATI cards (the 9800GT has 128, while the 5670 has 400!). The same applies to memory - the NVidia card uses a wider memory path, so while the memory runs at a slower clock speed it moves more data with each transfer.

    The only way to actually compare the performance of two cards using such different approaches is to benchmark them running a variety of applications.
    Hidiously simplified, however when you start getting into the detail of how it all works is gets very headache inducing.
    I can go into more detail if you like but don't blame me if your ears start bleeding.

    So yes, that's basically it, ati and nvidia use different systems within there cards so the best way to judge actual game perfromance is to look at benchmarks which show how a card actually performs in games.
    And you need to look at multiple games (or specific games that relate to you if you only play particular games) as the performance of different cards will vary depending on the game.
    ie some games do better with ati cards some do better with nvidia cards.

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