- Nvidia gtx 680 overclock generator#
- Nvidia gtx 680 overclock driver#
- Nvidia gtx 680 overclock manual#
Personally I think with the latest generation of cards from both AMD and NVIDIA, that both have some sort of power limiting system that messes with your overclock, the best stress testing is playing your favorite games. If that happens, it's best that you restart the system to make sure it is fully stable and working well, before trying a slightly reduced clock frequency.
Nvidia gtx 680 overclock driver#
It also notifies you when the card crashes, causing a driver reset. Out of the games in our benchmark suite I found Unigine Heaven to be the best for stability testing. Further, 3DMark11 does not seem a good choice either, as it let me run much higher clocks than were stable in other tests. Putting it all togetherSo now that we know how overclocking works, let's put it to some good use.įinding maximum clocks is similar as before, except that you have to search for a new stress testing application as Furmark will run at significantly reduced clocks due to power limit, so the actual requested clocks will not be tested. The mechanism of voltage control will be the same however.
However, should the dynamic OC algorithm decide that it needs more juice because it wants to set a higher clock, your setting will be overriden for the time that this clock/voltage combination is active.Īs mentioned before, each card's individual set of voltages depends on a value stored in the GPU during production time, so actual voltages may differ. Once you manually set 1.137 V (one step up from 1.125 V), this voltage will become active. The voltage controller on the board has no support for I2C, so it can not be programmed directly.įor example, if the dynamic clock algorithm decides it wants to run the card at 1.125 V, then the voltage will be 1.125 V, despite any manually set voltage between 0.825 V (the available minimum) and 1.125 V. Voltage selection to higher levels is possible, but limited to the driver maximum of 1.175 V. It seems that the NVIDIA driver enforces a voltage minimum, which ensures dynamic OC is stable. Voltage TuningAdjusting voltage has become a little bit more difficult due to dynamic overclocking. This means that dynamic overclocking is only active for the GPU clock, which will make things a bit easier. Please note, both these runs were with board power limit set to default.Īs the data shows, memory clock is constant during 3D, the drops you see are from when the card switches to 2D clocks between tests. I picked +50 MHz and +100 MHz as both are rock stable and they provide some insight into how well clock scaling will work. Increased GPU ClockI tried running at various clock offsets to check what real-life performance boost they offer, because the clock offset is only a target value and actual clocks during gaming may differ, despite the selected clock offset. This means that no matter how hard you try using clock offsets, power limits and voltage settings, the card will always reduce clocks when it thinks it has to. The clock offset simply acts as additional input variable for the dynamic clock algorithm which also takes into account things like power consumption, temperature and GPU load.
Nvidia gtx 680 overclock generator#
Also directly accessing hardware to write clocks to the clock generator won't work as the algorithm in the driver will instantly overwrite it with what it thinks is right. As mentioned several times before, there is no way to turn off dynamic clocking, which means there is no way to go back to the classic overclocking method. NVIDIA has defined a hard limit of +549 MHz for the clock offset, which will certainly upset some extreme overclockers with liquid nitrogen. Think of it more as a "best effort plzplz" value than a hard setting. If the card runs into the power limit or something else comes up, the clocks will be lower than requested. You can only define a certain offset that the dynamic overclocking algorithm will _try_ to respect. Manually setting a specific GPU clock on the GeForce GTX 680 is not possible.
Nvidia gtx 680 overclock manual#
It's really important to understand the basics of the dynamic clock adjustments before trying to understand the implications for manual overclocking.
If you just skipped here, go back one page and read it. Manual overclockingOn the previous page we discussed how NVIDIA's GPU Bost works.
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