Solved

Crossfire-Ready or No? Please Help

I've been lurking here for a bit while I attempt to build my first computer, and have most of my components picked out I think. I'm trying to make a gaming computer that will last me for a few years without upgrades, then for a few more with some upgrades. So far I have:

Case: Antec Three Hundred Black Steel ATX Mid Tower Computer Case
DVD: LITE-ON 24X DVD Writer Black SATA Model iHAS424-98 LightScribe Support
CPU: Athlon II 640
Power: OCZ ModXStream Pro OCZ700MXSP 700W
OS: Windows 7 Home Premium 64-bit
Memory: OCZ Special Ops Edition 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600
Video Card: HIS Radeon 5770
Hard Drive: TBD, I'll just find the cheapest HD that gives me 500 GB or more
Motherboard: TBD (read rest of post)

Right now, I'm looking at an ASUS M4A79XTD EVO AM3 AMD 790X ATX AMD Motherboard. Basically, I have 2 questions:

1) Because I want this system to last and be upgradeable, I want a motherboard and power supply that can support an additional Radeon 5770 in CrossFire mode. Once the single 5770 is no longer enough for my gaming needs (probably a few years, since I don't need absolute max settings), I figure I can buy another 5770 and just pop it in. Is this worth it? It's probably an extra $50-$75 for this ability, since I need a bigger PSU and a better motherboard, let alone the eventual 2nd 5770.

2) Will that plan work with this motherboard? It says CrossFire compatible, but I noticed it only has 1 PCIe x16 slot, and I think each 5770 needs x16, but am not sure as I'm somewhat of a novice in this field. Is there a better motherboard for this? And if it's not worth it, which motherboard should I go with? Do my other parts make sense as well?

Thanks in advance for any help provided.
4 answers Last reply Best Answer
More about crossfire ready help
  1. That motherboard has gotten a lot of bad reviews here are 2 other Mobos to consider.

    Gigabyte: http://www.newegg.com/Product/Product.aspx?Item=N82E16813128416

    Asus: http://www.newegg.com/Product/Product.aspx?Item=N82E16813131646
  2. oddtodd said:
    1) Because I want this system to last and be upgradeable, I want a motherboard and power supply that can support an additional Radeon 5770 in CrossFire mode. Once the single 5770 is no longer enough for my gaming needs (probably a few years, since I don't need absolute max settings), I figure I can buy another 5770 and just pop it in. Is this worth it? It's probably an extra $50-$75 for this ability, since I need a bigger PSU and a better motherboard, let alone the eventual 2nd 5770.


    The HD 5770s aren't very power hungry. If you are already buying a decent quality power supply, you shouldn't need to worry about power output (500W or more is plenty). I think it's worth it if you plan to purchase the second HD 5770 in the next year or so; after that it may be more difficult to find a suitable HD 5770 and a crossfire HD 5770 setup will be less competitive.

    oddtodd said:
    2) Will that plan work with this motherboard? It says CrossFire compatible, but I noticed it only has 1 PCIe x16 slot, and I think each 5770 needs x16, but am not sure as I'm somewhat of a novice in this field. Is there a better motherboard for this? And if it's not worth it, which motherboard should I go with? Do my other parts make sense as well?


    The HD 5770 does not require an x16 slot. That motherboard has an x8/x8 mode for crossfire. You shouldn't see any decrease in performance from running an HD 5770 on x8 PCI-E; the HD 5770 can't use up that much bandwidth (two GTX 480s in SLI only show a single digit decrease in performance in 8x/8x).

    http://www.tomshardware.com/reviews/pcie-geforce-gtx-480-x16-x8-x4,2696-9.html
  3. Best answer
    That motherboard does have two PCIEx16 slots. If you use both of them, only half the lanes will be running, which is called x8 mode. As stated above, thats not a problem for a 5770.
    Quote:
    PCI Express 2.0 x16: 2 (one x16 or dual x8 link)


    I still dont think you should buy that motherboard. It is an older 790 chipset and does not include USB3 or SATA3. For around the same price there will be a newer motherboard that does have those (and probably the newer 890 chipset).

    Like this Gigabyte GA-890XA-UD3
    http://www.newegg.com/Product/Product.aspx?Item=N82E16813128438

    or cheaper ASRock 870 Extreme3
    http://www.newegg.com/Product/Product.aspx?Item=N82E16813157198
  4. Best answer selected by oddtodd.
Ask a new question

Read More

Homebuilt Systems Product