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A GTX 680 can often gain useful performance from a careful overclock, but there is no universal clock or voltage that every card will sustain. Start with the card’s power target, tune the core and memory separately, and judge the result by sustained clocks, temperature, power, noise and repeatable stability—not by a single headline frequency.
What the GTX 680’s boost system actually does
The GTX 680 uses NVIDIA’s first-generation, power-target-based GPU Boost. Its published 3D base clock is 1006 MHz, with a 1058 MHz typical boost clock (NVIDIA, 2012). The GPU raises clock and voltage automatically when power, temperature and workload conditions permit. NVIDIA described this as autonomous operation without game profiles or user intervention.
Boost is dynamic rather than a fixed speed. Tom’s Hardware recorded a GTX 680 moving between 1071 and 1124 MHz during one benchmark run (2012). Therefore, report an overclock as the applied offset and the sustained clock range it produces in a workload, not as one guaranteed frequency.
Know your exact card before changing anything
Legacy GTX 680 boards can differ substantially. Record the manufacturer and model, cooler type, BIOS version, power connectors and whether the card is reference, factory-overclocked, used or refurbished. These details affect cooling, permitted power target and achievable boost behavior.
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- Base Clock: 1006MHz
- Boost Clock: 1058MHz
- Memory Clock: 6000MHz
- Cuda Cores: 1536
- Pci-E 3.0. Minimum of a 550 Watt power supply
- Check that both fans operate and that the heatsink is free of dust.
- Confirm adequate case intake and exhaust airflow.
- Use a reliable power supply with the required PCIe connectors.
- If thermal compound has dried or a fan is failing, repair that first; overclocking cannot compensate for defective cooling.
Establish a stock baseline
Before changing a setting, save a stock profile and record the same repeatable benchmark or game sequence you will use later. Log idle and load temperature, fan speed, observed clock, memory clock and power behavior. This gives you a recovery point and shows whether an apparent overclock gain is actually caused by a different workload or fan curve.
Temperature, power and voltage limits
AnandTech cites 98 °C as the GTX 680’s maximum GPU temperature (2012). That is a specification ceiling, not a sensible daily target. Prefer materially lower sustained temperatures for less noise and better long-term margin, and stop testing if the card approaches the ceiling or begins to throttle.
Rank #2
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NVIDIA specifies 170 W typical board power for the GTX 680 and its GPU Boost design (2012). Actual draw changes with workload and with the selected power target. Raising the target can prevent power limiting, but it does not guarantee a higher clock if temperature, voltage or silicon quality becomes the next limit.
Voltage adjustment is an advanced step. AnandTech’s EVGA Classified testing found different behavior with and without overvolting and higher wall power after the power target was raised. Do not copy a voltage value from another GTX 680: BIOS limits, cooler condition, ASIC quality, ambient temperature and PSU capacity all change the risk.
Rank #3
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A careful overclocking procedure
- Open a board-partner overclocking utility. Use a tool that supports your specific card and can display clock, temperature, fan speed and power behavior. Keep the saved stock profile available.
- Raise the power target first. Increase it only within the range the utility and card BIOS permit. This follows NVIDIA’s documented method. Watch temperature and power immediately after applying it.
- Increase the core offset in small steps. Apply a modest offset, run the same short test, and inspect the clock trace. Look for visual artifacts, driver recovery, application crashes or unexpected clock drops. At the first reproducible failure, return to the previous step.
- Tune memory separately. Restore the last stable core value, then raise the memory offset in small increments. Memory instability may appear as sparkles, corrupted textures, flickering or crashes even when the core appears stable. Revert one step when that occurs.
- Use voltage only when necessary and supported. If a higher offset is unstable, first check temperature and power limiting. Any voltage increase adds heat and board power; never assume a value is safe merely because another sample used it.
- Validate the complete profile. Run several longer benchmarks and the games or applications you actually use. A successful benchmark pass establishes stability only for that workload.
- Compare against stock. Record sustained clock range, frame rate or completion time, peak temperature, board or wall power, fan speed/noise and any instability. Include driver version, ambient temperature, card variant and every changed setting.
How far can a GTX 680 overclock?
Results are sample-dependent. NVIDIA demonstrated a GTX 680 running above 1.2 GHz, but that is evidence of one card’s capability, not a guaranteed setting. A different ASIC, BIOS, cooler, room temperature or workload may produce a lower or higher result. Treat the stable offset and sustained range from your own testing as the answer for your card.
| Reference point | What it means | Qualification |
|---|---|---|
| 1006 MHz | Published base 3D clock | NVIDIA specification, 2012 |
| 1058 MHz | Published typical boost clock | NVIDIA specification, 2012; not a fixed speed |
| 1071–1124 MHz | Observed clock movement in one benchmark | Tom’s Hardware test, 2012; workload-specific |
| Above 1.2 GHz | Demonstrated overclock example | NVIDIA test example; not a universal guarantee |
| 98 °C | Maximum GPU temperature cited | AnandTech, 2012; ceiling, not a daily target |
| 170 W | Typical board-power specification | NVIDIA, 2012; actual draw varies with workload and power target |
When a better cooler or new thermal paste is worthwhile
Improve cooling before adding voltage or chasing a larger offset. A clean heatsink, working fan and sensible case airflow are the first interventions. Repasting can help a used card whose original compound has degraded, but it requires disassembly, carries handling risk and may not overcome a restrictive cooler or BIOS power limit. Compare peak temperature and fan speed at stock before and after maintenance; only then decide whether extra clock headroom exists.
Rank #4
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- Product Type - Video Card
Common symptoms and what to do
- Artifacts or corrupted textures: reduce the memory offset first; if they persist, lower the core as well.
- Driver reset or application crash: revert the most recent clock change and retest at the prior stable value.
- Clock falls despite a higher offset: check temperature and power-limit flags; a larger power target cannot remove a thermal limit.
- Higher noise with little performance gain: compare sustained clocks and frame rates with stock; the workload may already be limited elsewhere.
- Instability only in one game: treat that title as a separate validation workload rather than declaring the profile universally stable.
How to compare GTX 680 cards or profiles
Use the same resolution and repeatable workload, then compare sustained boost clock, performance, peak GPU temperature, board or wall power, fan noise and stability across multiple applications. Also note cooler and PCB design, BIOS behavior and whether each sample is reference, factory-overclocked, used or refurbished. Advice written for later temperature-based GPU Boost 2.0 or 3.0 cards does not directly describe this first-generation GTX 680 behavior.
The Bottom Line
The sensible GTX 680 overclock is the highest offset your individual card can sustain through its real workloads while remaining well below the 98 °C ceiling, within its power and cooling capability, and free of artifacts or crashes. Start with the power target, tune core and memory independently, and keep the verified profile—not a promised universal number.
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