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790GX Vs new 790FX "hawkfish" MB's

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  • 790GX Vs new 790FX "hawkfish" MB's

    Hi Everyone, as a long suffering AMD fan i have been waiting for a decent AM2+ Motherboard with the SB750 and have been putting off my upgrade until they appear

    I have now had my interest peaked by the new 790GX chipset. to me the are identical feature wise with the 790FX except from the Dual 8x pci-e slots (which is a mute point as Crossfire maybe coming but not here yet)

    so considering that most MB with the 790GX set may sell cheaper than the new hawkfish board because of IGP that is still yet to see the light of day, and also that the only games I regularly play are UT2004, their mods and ut3 (fingers crossed) am i better just getting a 790GX board + 4850 card and saving some money with a cheaper board? will the restricted lanes ever hinder the performance if we are ever able to go crossfire?

  • #2
    Originally posted by acreda View Post
    to me the are identical feature wise with the 790FX except from the Dual 8x pci-e slots (which is a mute point as Crossfire maybe coming but not here yet)
    I think it was already pointed out elsewhere: the 790GX supports PCIe 2.0, a PCIe 2.0 x8 slot has the same bandwidth as a PCIe 1.0 x16 which is already plenty.

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    • #3
      you should think twice about SB750.. apparently the sata and usb performance is not very good..

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      • #4
        Originally posted by Redeeman View Post
        you should think twice about SB750.. apparently the sata and usb performance is not very good..
        I thought it was "improved" over the SB600. SATA and USB performance isn't *that* bad with SB600; it could be better, but it's nothing that will make you cut yourself. If overall performance is better than with SB600 that would be a plus.

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        • #5
          deanjo says write performance on sata is 45% that of competing chipsets....

          as for usb, he also says its alot worse than other chipsets...

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          • #6
            I can't get the bonnie++ tets to run properly, so here is a run with iozone. SB600 with a single SATAII HDD:




            http://global.phoronix-test-suite.co...81-27156-31933

            Someone has a competing Intel/nvidia solution to compare to?

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            • #7


              Nforce 780a on a old Maxtor 6B250S0 drive.
              Last edited by deanjo; 08-07-2008, 10:19 PM.

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              • #8
                When I had a couple of Maxtor 6B250S0's running dmraid in raid 0

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                • #9
                  Is there a way to test USB performance?

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                  • #10
                    This may explain it, there is a set of benchmarks from the guys at Tech Report http://www.techreport.com/articles.x/15256 stating that the South bridge is runing in IDE and therefore the SB750 is not doing NCQ which would indicate the poor performance for writing speeds (burst speeds are fine) I understand that this ACHI problem existed in the SB600, why has it been carried over if its true?!?!?

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                    • #11
                      Originally posted by acreda View Post
                      This may explain it, there is a set of benchmarks from the guys at Tech Report http://www.techreport.com/articles.x/15256 stating that the South bridge is runing in IDE and therefore the SB750 is not doing NCQ which would indicate the poor performance for writing speeds (burst speeds are fine) I understand that this ACHI problem existed in the SB600, why has it been carried over if its true?!?!?

                      ACHI mode does not really work with the SB600 (some BIOS on certain boards even remove the option). According to that review, the new SB still has issues with AHCI, so I think that's why they did not use it. AMD hyped this SB750 so much that I'm rather disappointed; the "extra overclocking" seems more like a gimmick as well.
                      Last edited by Melcar; 08-09-2008, 10:07 PM.

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                      • #12
                        AMD hyped this SB750 so much that I'm rather disappointed;
                        Just curious, where are you finding all this hype ? I hadn't even seen the SB750 mentioned in the press other than as a companion to the 790GX.

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                        • #13
                          Originally posted by bridgman View Post
                          Just curious, where are you finding all this hype ? I hadn't even seen the SB750 mentioned in the press other than as a companion to the 790GX.
                          Maybe it was just the particular circles I frequent that were guilty of this over hyping.

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                          • #14
                            Originally posted by Melcar View Post
                            Maybe it was just the particular circles I frequent that were guilty of this over hyping.
                            Well we will have to wait for the Linux benchmarks from Phoronix, Generally i find their results accurate, i hope it's going to be tested against the N 750 chipset and the old 708G with the old south bridge. do you think anyone will advise when article will be out, i assue there will be one? if it is reasonably close then i will want to stay with AMD for the Crossfire and ACC. after all if something is taking a while to copy over I'll just go a get myself a drink!

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                            • #15
                              Originally posted by bridgman View Post
                              Just curious, where are you finding all this hype ? I hadn't even seen the SB750 mentioned in the press other than as a companion to the 790GX.
                              How about these:

                              http://www.amd.com/us-en/Corporate/V...127446,00.html

                              http://www.anandtech.com/cpuchipsets...oc.aspx?i=3360

                              http://www.hardwarezone.com/articles...?cid=6&id=2618

                              http://www.bit-tech.net/hardware/200...gp-and-sb750/1

                              http://news.softpedia.com/news/SB750...ed-90672.shtml

                              http://www.fudzilla.com/index.php?op...=6956&Itemid=1

                              Plus hundreds of others, people expected alot from this chipset. Of course the hyped OC'ing capability of the chipset is pretty much a useless feature in linux as there is no overdrive utility for linux (such utilities are badly absent in linux).

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