Intel has released three different processors so far that are all based on the LGA 1156 interface: the Core i5-750 at 2.66 GHz, the Core i7-860 at 2.8 GHz, and the faster Core i7-870 at 2.93 GHz. These processors not only differ in their base clock speed, but also in how Turbo Boost performance acceleration is implemented. The 800-series can speed up individual cores more aggressively than the other models. Let’s have a quick look.
Turbo Boost: Available Bins (Under TDP/A/Temp)
|Processot Number||Frequency||4 Cores Active||3 Cores Active||2 Cores Active||1 Core Active|
|Core i7-870||2.93 GHz||2||2||4||5|
|Core i7-860||2.8 GHz||1||1||4||5|
|Core i5-750||2.66 GHz||1||1||4||4|
|Core i7-975||3.33 GHz||1||1||1||2|
|Core i7-950||3.06 GHz||1||1||1||2|
|Core i7-920||2.66 GHz||1||1||2||2|
You would expect that faster processor models tend to be more overclockable, but this isn’t a given and may vary. Since the core is the same for all existing LGA 1156-based processors, we decided to look at the pricing structure before making a decision. The 1,000-unit price for the Core i7-870 is $562. We believe that’s too expensive for most cost-conscious enthusiasts, and decided to instead check out the remaining models: Core-i7-860 at $284 and the i5-750 at $196.
Since our launch coverage and related articles typically utilize the faster models, we decided to go for the entry-level processor in our initial overclocking project. This model should be the most attractive for the majority of our readers.
We start with a 2.66 GHz base clock and a Turbo Boost implementation able to take the chip to a maximum of 3.2 GHz. Since the Core i7-870 reaches 3.6 GHz at maximum Turbo Boost speed for a single core, we decided to start our overclockings at 3.6 GHz as well, and look to see where the most affordable Core i5 can go.
- Maximizing Core i5 Value Through Overclocking
- Choosing The Best LGA 1156 Processor For Overclocking
- Platform And Results Without A Voltage Increase
- Speeding Up: Up To 4 GHz With More Voltage
- Overcoming Stability Issues At 4.1 GHz
- Clock Speed/Voltage Table And Test Setup
- Results: Synthetic Benchmarks
- Results: Games, 3DMark Vantage
- Results: Applications
- Results: Audio/Video
- Results: Power Consumption And Efficiency