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AMD Radeon HD 7750 or HD 7770 for PCI-Express 1.0 x16 slot systems?

Hello,
Both the 1gb Radeon HD 7750 and 1gb HD 7770 are PCI-Express 3.0 cards. What amount (if any) is video game performance difference is there between a Radeon HD 7750 and a Radeon HD7770 in an older system with only a PCI-Express 1.0 x16 slot (motherboard is Asus P5LP-LE w/ parallel printer port also know as HP Emery-UL8E with chipset Intel 945P Express, cpu Intel Pentium D 920 @ 2.8ghz) running MS-Win7 (I also duel boot to LINUX, but do little gaming in that space)? Since both cards will be step down to PCI-Express 1.0 x16 interface throughput, is there any performance diff between them? At writing, there is a $25 cost diff between the two video cards, but the HD 7750 box claims it will work with my exiting 300 watt power supply. If I go with HD 7770 I would also need to install new 500 watt power supply, which with how the HP Media Center PC is wired, is an intrusive job. I see ATX 500 watt 80 plus silver power supplies going for $60, so if I don't break anything during install, going with HD 7770 is going to cost me $85 more. Will I see $85 worth of greater performance with the HD 7770 in a PCI-Express 1.0 x16 slot over the HD-7750?
12 answers Last reply Best Answer
More about radeon 7750 7770 express slot systems
  1. Get the HD 7750 it is best deal BUT
    Read this
    http://www.tomshardware.com/forum/344044-33-pcie-pcie
  2. Hi xtreme5,

    From research I have done, it appears to me that both cards will work in the PCI-Express-1 x16 slot in my old system. I not sure what you mean by "best deal"? Question is; does the HD 7770 perform better than the HD 7750 when both are downgraded by being in a PCI-Express-1 x16 slot? If yes, how much better? $85 worth better?

    I should have mentioned the games I play, sorry. They are; flight simm, skyrim, and heroup (later is off the internet).

    Thx
  3. Best answer
    The 7770 will not be bottlenecked at all by pci-e 1.0. It should play games about 20% faster than the 7750 regardless of the pci-e slot.
  4. yeah HD 7770 is faster.
  5. Best answer selected by r2d2-4-me.
  6. Thank you xtreme5 and kevin83 for your valued input.
  7. Will pci 1.0x16 work on pci 3.0x16
  8. Will pci 3.0x16 work on pci 1.0x16
  9. skpatel71 said:
    Will pci 3.0x16 work on pci 1.0x16


    Kicking up a dead thread I know; but I don`t like to leave other peole reading persistently false information.

    So I have a `HP` PCI-e 1.0 x16 Motherboard (Old Athlon x64 chip), and I have bought TWO HD7770`s over the months (PCI-e 3.0 x16) and NEITHER Work in the motherboard, no matter which drivers I try and use; after I read dozens of threads telling me thyat I could as all graphics cards are backwards compatible.
    THEY ARE NOT.

    You can only use up to a PCI-e 2.0 (NOT 2.1) x16 graphics card in a PCI-e x16 1.0 motherboard.

    So; anyone want two HD7770`s barely touched.
    The rig works perfect using an old X1950 XTX 512.
    But I wanted 1Gb.

    ?
    The best many people in a similar situation can hope for a up to a HD 4970 x2 or something.

    After; the 5000 series you need a slot 2.1 Mo-bo

    Kill the thread now.
  10. Roger Rogers-1382392 said:
    skpatel71 said:
    Will pci 3.0x16 work on pci 1.0x16


    Kicking up a dead thread I know; but I don`t like to leave other peole reading persistently false information.

    So I have a `HP` PCI-e 1.0 x16 Motherboard (Old Athlon x64 chip), and I have bought TWO HD7770`s over the months (PCI-e 3.0 x16) and NEITHER Work in the motherboard, no matter which drivers I try and use; after I read dozens of threads telling me thyat I could as all graphics cards are backwards compatible.
    THEY ARE NOT.

    You can only use up to a PCI-e 2.0 (NOT 2.1) x16 graphics card in a PCI-e x16 1.0 motherboard.

    So; anyone want two HD7770`s barely touched.
    The rig works perfect using an old X1950 XTX 512.
    But I wanted 1Gb.

    ?
    The best many people in a similar situation can hope for a up to a HD 4970 x2 or something.

    After; the 5000 series you need a slot 2.1 Mo-bo

    Kill the thread now.


    It is backwards compatible however your motherboard vendor will have to release a bios update to support 2.1 and up. If your card isn't working in the 1.0 slot then that is down to the motherboard and not the actual slot version.
  11. nimbah_52 said:
    Roger Rogers-1382392 said:
    skpatel71 said:
    Will pci 3.0x16 work on pci 1.0x16


    Kicking up a dead thread I know; but I don`t like to leave other peole reading persistently false information.

    So I have a `HP` PCI-e 1.0 x16 Motherboard (Old Athlon x64 chip), and I have bought TWO HD7770`s over the months (PCI-e 3.0 x16) and NEITHER Work in the motherboard, no matter which drivers I try and use; after I read dozens of threads telling me thyat I could as all graphics cards are backwards compatible.
    THEY ARE NOT.

    You can only use up to a PCI-e 2.0 (NOT 2.1) x16 graphics card in a PCI-e x16 1.0 motherboard.

    So; anyone want two HD7770`s barely touched.
    The rig works perfect using an old X1950 XTX 512.
    But I wanted 1Gb.

    ?
    The best many people in a similar situation can hope for a up to a HD 4970 x2 or something.

    After; the 5000 series you need a slot 2.1 Mo-bo

    Kill the thread now.


    It is backwards compatible however your motherboard vendor will have to release a bios update to support 2.1 and up. If your card isn't working in the 1.0 slot then that is down to the motherboard and not the actual slot version.


    It either will work, or it won`t.

    It doesn`t.

    QED

    As no manufacturer makes BIOS updates for 2005 Motherboards, (the latest [& only] BIOS update was 2006) while it does not work with Gen 2.0 Graphics cards after the HD4890, then as there is no BIOS update, then it CANNOT WORK With Gen 2.0 Graphics Cards.

    REALITY is more realistic than theory.
  12. nimbah_52 said:
    Roger Rogers-1382392 said:
    skpatel71 said:
    Will pci 3.0x16 work on pci 1.0x16


    Kicking up a dead thread I know; but I don`t like to leave other people reading persistently false information.

    So I have a `HP` PCI-e 1.0 x16 Motherboard (Old Athlon x64 chip), and I have bought TWO HD7770`s over the months (PCI-e 3.0 x16) and NEITHER Work in the motherboard, no matter which drivers I try and use; after I read dozens of threads telling me that I could as all graphics cards are backwards compatible.
    THEY ARE NOT.

    You can only use up to a PCI-e 2.0 (NOT 2.1) x16 graphics card in a PCI-e x16 1.0 motherboard.

    So; anyone want two HD7770`s barely touched.
    The rig works perfect using an old X1950 XTX 512.
    But I wanted 1Gb.

    ?
    The best many people in a similar situation can hope for a up to a HD 4970 x2 or something.

    After; the 5000 series you need a slot 2.1 Mo-bo

    Kill the thread now.


    It is backwards compatible however your motherboard vendor will have to release a bios update to support 2.1 and up. If your card isn't working in the 1.0 slot then that is down to the motherboard and not the actual slot version.

    I get the THEORY you point out.

    But. It either will work, or it won`t (the combination of 1.0 Motherboards and 2.0 Graphics cards [AMD Cards AFTER the HD4890]).
    Don`t forget I am talking about people BUYING something like a 2.0 AMD HD7770 for a Gen 1.0 Motherboard.

    It doesn`t work.

    QED
    As no manufacturer makes BIOS updates for 2005 Motherboards, (the latest [& only] BIOS update was 2006) while it does not work with Gen 2.0 Graphics cards after the HD4890, then as there is no BIOS update, then it/they CANNOT WORK With Gen 2.0 Graphics Cards or later Gen 3 ones etc...

    With all due respect, Fact of life 101;-

    REALITY is more realistic than theory.
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