- Nov 4, 2015
- 2
- 0
- 4,510
Searched online extensively, can't find a solution:
Core System:
CPU: Intel i7-950 bloomfield, 3 ghz, socket 1366
MOBO: Gigabyte ud3r x58a rev. 2
RAM: Corsair xms3 ddr3 24gb
GPU: Gigabyte GTX 680 4GB
PSU: Corsair 1200W Gold
Overclock settings:
Overclocked to 3.7 ghz
-- 160 base clock x 23 (default is 133*23)
-- Uncore at 20x, SPD (mem multiplier) at 10x
-- QPI voltage at 1.39v (default is around 1.2v)
-- Load Line Calibration Level 2
-- CPU V-Core auto-managed by BIOS Dynamic V-Core - 1.2v-1.5v range
-- In practice, the system kept V-Core at 1.5v max
-- Everything else on auto
Stable for months, no issues. Played tons of games, heavy Photoshop work that taxed the system. Rock solid.
Last night, put in my brand new video card: Gigabyte GTX 980 TI 6GB
Played the Witcher 2 at full settings for a few hours. No issues. Love it. (Yes #2, playing the series in order and haven't got to W3 yet =)
Turn on computer today. BIOS says boot failure due to overclock. Reset CMOS to factory defaults. Boots up fine. Go back to BIOS. Re-enter same overclock settings as before (I had them noted in a file so this was easy to remember). Failure to boot or post - just black screen.
Swap video cards and put old GTX 680 back in. Everything boots up fine, back in business with the same overclock as before.
Further testing, system won't boot with the new GTX 980 installed if there is ANY kind of overclock. Even just raising the base clock from 133mhz to 135mhz while leaving everything else the same = no boot, no post, black screen. Even a minor overclock to 140mhz with the lower-than-stock uncore/SPD at 6x/12x and same voltage settings as above = no boot, no post, black screen.
Looking forward to Fallout 4, but would like to get this sorted before then. Or buy a new system. Not sure why I got a few hours in yesterday with the old overclock settings plus the new card. But it won't work anymore anyway.
TL;DR: Why would putting a new video card into a stable overclocked system turn it into one that will take no overclock at all?
UPDATE: Spent several hours trying to debug this last night. Tried running on half the ram (only 3x4gb instead of 6x4gb). Tried various tweaks and changes. Basically with any type of change to either bclock, uncore multiplier, or spd multiplier, I get a black screen. It is definitely the motherboard - I could tell because the LED configuration on the board would be different if the computer failed to boot. Unfortunately the LED configuration doesn't tell me much - no warnings about overvoltage or temps or anything.
My suspicion at this point is that this board needs a BIOS update to be compatible with this GPU. Since I am already on the latest non-Beta BIOS, and there hasn't been an update since 2011, it looks like I am going to have to get a new motherboard/cpu/cooler/memory combo if I want to use this new GPU. Which I do.
Core System:
CPU: Intel i7-950 bloomfield, 3 ghz, socket 1366
MOBO: Gigabyte ud3r x58a rev. 2
RAM: Corsair xms3 ddr3 24gb
GPU: Gigabyte GTX 680 4GB
PSU: Corsair 1200W Gold
Overclock settings:
Overclocked to 3.7 ghz
-- 160 base clock x 23 (default is 133*23)
-- Uncore at 20x, SPD (mem multiplier) at 10x
-- QPI voltage at 1.39v (default is around 1.2v)
-- Load Line Calibration Level 2
-- CPU V-Core auto-managed by BIOS Dynamic V-Core - 1.2v-1.5v range
-- In practice, the system kept V-Core at 1.5v max
-- Everything else on auto
Stable for months, no issues. Played tons of games, heavy Photoshop work that taxed the system. Rock solid.
Last night, put in my brand new video card: Gigabyte GTX 980 TI 6GB
Played the Witcher 2 at full settings for a few hours. No issues. Love it. (Yes #2, playing the series in order and haven't got to W3 yet =)
Turn on computer today. BIOS says boot failure due to overclock. Reset CMOS to factory defaults. Boots up fine. Go back to BIOS. Re-enter same overclock settings as before (I had them noted in a file so this was easy to remember). Failure to boot or post - just black screen.
Swap video cards and put old GTX 680 back in. Everything boots up fine, back in business with the same overclock as before.
Further testing, system won't boot with the new GTX 980 installed if there is ANY kind of overclock. Even just raising the base clock from 133mhz to 135mhz while leaving everything else the same = no boot, no post, black screen. Even a minor overclock to 140mhz with the lower-than-stock uncore/SPD at 6x/12x and same voltage settings as above = no boot, no post, black screen.
Looking forward to Fallout 4, but would like to get this sorted before then. Or buy a new system. Not sure why I got a few hours in yesterday with the old overclock settings plus the new card. But it won't work anymore anyway.
TL;DR: Why would putting a new video card into a stable overclocked system turn it into one that will take no overclock at all?
UPDATE: Spent several hours trying to debug this last night. Tried running on half the ram (only 3x4gb instead of 6x4gb). Tried various tweaks and changes. Basically with any type of change to either bclock, uncore multiplier, or spd multiplier, I get a black screen. It is definitely the motherboard - I could tell because the LED configuration on the board would be different if the computer failed to boot. Unfortunately the LED configuration doesn't tell me much - no warnings about overvoltage or temps or anything.
My suspicion at this point is that this board needs a BIOS update to be compatible with this GPU. Since I am already on the latest non-Beta BIOS, and there hasn't been an update since 2011, it looks like I am going to have to get a new motherboard/cpu/cooler/memory combo if I want to use this new GPU. Which I do.
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