Thread updated with solution for modding the bios:
Anyone have any insight on how to control the PCI bus wait states in an RS480/RS482 SB400 chipset?
I installed a raid-0 array using an add-in pci card based on the Sil3112A. Using the same exact board and drives on two different machines generate two radically different results.
Using the mobo based on RS480/RS482 and SB400 chipset I see a max of ~63MB/sec, with burst=max.
Placing the same array in a KT600 based system I see max ~100mb/sec with burst=~102.
If I change the PCI to 0 wait states on the KT600 system I can end up with the results for the RS480, e.g. ~60Mb/sec.
The RS480 mobo shows 3 PCI buses hanging off it(using SiSoft), with the 3 slots on the mobo all mapped to PCI bus 3 (verified by phsyically changing slots board was plugged into.
Is there any type of datasheet on the ATI chipset around? Any programmers refernces deaing with this level of detail?
I have looked at BIOS screen from other mobo's based upon the same chipsets but see no control over PCI bus wait states in them either, but also cannot tell if they force wait states or not.
No need to ask if a newer bios is available for the mobo I have, it is an HP proprietary AmberineM (Asus A8-LE), nothing to be found so far.
Anyone have any insight on how to control the PCI bus wait states in an RS480/RS482 SB400 chipset?
I installed a raid-0 array using an add-in pci card based on the Sil3112A. Using the same exact board and drives on two different machines generate two radically different results.
Using the mobo based on RS480/RS482 and SB400 chipset I see a max of ~63MB/sec, with burst=max.
Placing the same array in a KT600 based system I see max ~100mb/sec with burst=~102.
If I change the PCI to 0 wait states on the KT600 system I can end up with the results for the RS480, e.g. ~60Mb/sec.
The RS480 mobo shows 3 PCI buses hanging off it(using SiSoft), with the 3 slots on the mobo all mapped to PCI bus 3 (verified by phsyically changing slots board was plugged into.
Is there any type of datasheet on the ATI chipset around? Any programmers refernces deaing with this level of detail?
I have looked at BIOS screen from other mobo's based upon the same chipsets but see no control over PCI bus wait states in them either, but also cannot tell if they force wait states or not.
No need to ask if a newer bios is available for the mobo I have, it is an HP proprietary AmberineM (Asus A8-LE), nothing to be found so far.
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