NVIDIA GTX 680 OVERCLOCK PC
NVIDIA GTX 680 OVERCLOCK SERIES

Therefore demanding games like Battlefield 3 are playable in 1366x768 and medium settings. The gaming performance of the GeForce GT 645M equipped with DDR3 graphics memory depends on the 3D clock in the used laptop and is slightly above an average GT 640M. The implementation of this boost mode is done in the BIOS, but it is ultimately dependent upon the manufacturer of the laptop.

NVIDIA GTX 680 OVERCLOCK SERIES

PCIe 3.0 is now supported by the mobile Kepler series and an optional Turbo mode can automatically overclock the Nvidia card by a theoretical 15 percent if the laptop cooling system allows it. However, due to the missing hot clock of the shader domain, two shaders of a Kepler chip are as fast as one shader of a Fermi chip (the latter is clocked twice as fast). Although more shader cores are available in the Kepler architecture as compared to the Fermi design, the Kepler shaders are still expected to be up to twice as power efficient. The GK107 Kepler core offers two shader blocks, called SMX, each with 192 shaders for a total of 384 shader cores that are clocked at the same speed as the processor core. The Kepler architecture is the successor to the Fermi architecture that first appeared in laptops with the GeForce 400M series. The graphics card uses a 128-Bit wide memory interface with either the more common but slower DDR3 for VRAM or the more expensive and faster GDDR5. It is a faster clocked GeForce GT 640M and therefore also based on the Kepler GK107 architecture manufactured in 28nm at TSMC. The NVIDIA GeForce GT 645M is a mid-range, DirectX 11.1 compatible graphics card that was announced in the third quarter of 2012 for laptops. Mind you that we left fan RPM at default settings.NVIDIA GeForce GT 645M ► remove from comparison Let's go check out what that does to the boards power draw, noise and heat levels. We now have some extra performance at our hands, we'll have a peek at the results when overclocked later. At this stage under stress the cooler RPM went up a little as such the noise level now has risen towards roughly 42~43 DBa, still very doable. So for the core we ended at 1300 MHz (Dynamic boost will shift it up/down a little) absolutely stable and for the memory we ended at a staggering 7128 MHz (effective data rate). The dynamic clock will still kick in, albeit not extreme. In the upper monitoring graph you can see that we had a stress application running in the background. We added another 200 MHz towards the graphics core and end at roughly 1250 MHz on the core. So once that is 100% ready, stable and finalized we might publish another 'extreme' overclocking article. EVGA's precision does support it upto 1.15V but it really didn't make a difference. That way the Dynamic boost function won't down clock all the time to meet its upper threshold in TDP limitations.Īgain Voltage tweaking was at the time of writing not yet available.

We can widen up the TDP limitations a bit, set the power limiter towards its maximum 132%. In afterburner we go into the preferences. Mind you that for overclocking we used an unreleased version AfterBurner. Now with the Dynamic boost function of the series 600 cards, overclocking is definitely going to be more complicated.

NVIDIA GTX 680 OVERCLOCK PC

So make sure your PC casing is well ventilated with decent airflow.

That backside of your graphics card however gets hot as well, give it some airflow too. Cooling helps with overclocking, it's a s simple as that. If you are willing to allow more noise, increase the fan RPM on the GPU towards a higher setting that you find comfortable. Related to heat is your graphics card cooling system. Once you get artifacts or a lockup, back down 25 to 50 MHz and typically that is your stable result in it's highest threshold - under the condition that the room temperature is the same (yes heat and surrounding heat have an influence on your overclock). In the first stage you overclock your GPU, in the second the memory.

First off let us remind you that we always recommend increments of 25 MHz on core and memory (from the default base clock frequency upwards). When you want to overclock typically you need to verify and stabilize your tested settings.

Nvidia gtx 680 overclock