Specs (new build):
CPU- i5 3570k w/ Hyper 212 + 120mm fan for pushpull
GPU- asus hd7870
PSU- XFX Core Edition PRO550W
MB- ASRock Z77 Pro4
RAM- GSkill RipjawsX 8g (4x2)
Case- NZXT Phantom full tower
DVD- some asus OEM standard dvdrw
HDD- WD caviar blue 500g
Ok, here's the problem.
I overclocked the i5 3570k ivy at 4.4ghz @ 1.2v, tested stable for a bit in prime 95.
I tried a bit of OCing on the card but I got artifacts/BSOD so I stepped it down.
Went into some games - Starcraft 2, Dota 2 - and got stuttering / freezes / crashes.
So I stepped the GPU OC all the way back down to factory - still stuttering / crashes in-game.
I tried re-installing drivers, installing old drivers, etc. Nothing worked.
Then I read that if your PSU isn't putting out enough power, you will get stuttering/crashing/etc.
So I reverted my CPU OC back to factory and rebooted... and everything worked perfectly.
Then I tried to get the CPU as high as possible on standard volts / -0.005v offset. Got it to 3.8 / 3.9, don't want to go any further.
So that's where I am right now. If I put more volts into the CPU to bring it to 4.0+, I start getting stuttering in-game.
It isn't the temps, I monitor them and they are perfectly within range of expected temperature.
Also I've noticed that while running Prime95 and Kombustor at the same time to test CPU + GPU load, It only allows the GPU's load to fluctuate around 65% - 70%.
When I turn Prime95 off, GPU load properly goes to 100%.
This leads me to believe that it must be a lack of power, because the individual stress testing of the CPU and GPU's overclocks are perfectly fine. But when tested together in a game, or together in a benchmark, they can't run at full power without stuttering/crashing/sacrificing load on one or the other.
That power supply is plenty powerful enough to run an IB CPU and GPU with them both overclocked. Maybe the mobo can't handle the stress? Try reducing the overclock on both until you can get it to run stable. It could be the RAM, too.
Advanced Turbo 30 - Disabled
Load Optimized CPU OC Setting - Disabled
Load Optimized GPU OC Setting - Disabled
CPU Ratio - All Core 38
Spread Spectrum - Auto
Intel Speedstep - Enabled
Intel Turbo Boost - Enabled
Additional Turbo Voltage - Auto
Internal PLL Overvoltage - Disabled
Long Duration Power Limit - Auto
Long Duration Maintained - Auto
Short Duration Power Limit - Auto
Primary Plane Current Limit - Auto
Secondary Plane Current Limit - Auto
GT Overclocking Support - Disabled
DRAM Timing Configuration - DDR3-1600 9-9-9-24 1.50v
Power Saving Mode -Disabled
CPU Voltage Offset - Offset Mode -0.005v
CPU Load-Line Calibration - 100%
DRAM Voltage - 1.500v
VTT Voltage - 1.076v
PCH Voltage - 1.059v
CPU PLL Voltage - 1.832v
VCCSA voltage - 0.925v
Now I'm trying OCCT's Power Supply test and it is extremely laggy/stutters a lot.
Is it normal for the PSU test in OCCT to be laggy?
Here's what appears to be happening: The GPU will get to 99% or 100% load for a few secs, but the system kicks it back down, thus causing a stutter/lag spike for a second. It will keep repeating this process.
RAM and VRAM usage seem to be normal, fluctuating depending on the game.