**Gigabyte GA-X58A-UD7 OC-Tips-Bios-Discussion Thread**

[Oblique82]

*** relevent update***

I have some significant progress. thankyou to everyone who has contributed so far.

Test: to determine the significance of the following settings on boot stability: EUP enable, usb mouse support disable, usb keyboard support disable, ioh at 1.26

Thankyou to the person above who noticed that high ioh with EUP on is mroe stable than off.

Method: to use relatively low cpu and ram settings to test motherboard boot stability only.

bclk 200
ioh at 1.26
cpu multi 19 (3.8 ghz)
Ram 8-8-8-20 2T x8 multi.
qpi/vtt 1.35
vcore 1.33
cpu pll 1.88
pci-e 1.5
vdimm 1.66

TOGGLE between: [EUP ON and USB keyboard and mouse DISABLED].... AND..... [EUP OFF with USB key and mouse ENABLED]

For each test power on case key pressed, machine allowed to boot to OS, then shutdown from os.

Results:
[EUP ON, mouse and key support off] 18 tests all PASS (successful boot to os and no red screen bios warning)

[EUP OFF, mouse and keyb support on] 5 tests all FAIL ( power on, c1, c1, c1, fans and mobo complete power off... reboot c1, c1, c1 all poiwer off, -> bios warning

conclusions:

this supports the theory that ioh 1.2 or more is consistently unstable during boot when EUP is OFF and mouse and keyboard legacy support is on. further testing is needed and this may reflect a specific hardware compatibility issue. either EUP or legacy keyboard/mouse or both may play a role.

EDIT: i still occasionally get a long lag on the POST 'splash screen'. anyone else have this sometimes?