Intel K Series Processors
Published: 7th June 2010 | Source: Intel | Price: £199 - £309 |
We've got two rather different processors on test today. Thankfully with the i5 being similar to the i7 we can save you having to read tons of tables by integrating them into one.
On the left is the i5-655K and on the right the i7-875K.
|# of Cores||2||4|
|# of Threads||4||8|
|Clock Speed||3.2 GHz||2.93 GHz|
|Max Turbo Frequency||3.46 GHz||3.6 GHz|
|Intel® Smart Cache||4 MB||8 MB|
|DMI||2.5 GT/s||2.5 GT/s|
|Instruction Set Extensions||SSE4.2||SSE4.2|
|Embedded Options Available||No||No|
|Lithography||32 nm||45 nm|
|Max TDP||73 W||95w|
|New AES Instructions||Yes||No|
As you can see they are both designed for fairly different markets, but roughly similar thanks to their use of the LGA1156 socket.
With the i5-655K we find it's absolutely identical to the i5-650 by being a hyperthreaded, dual-core processor with integrated graphics. One of the strange things is that the integrated graphics chip is manufactured using a 45nm process. So the processor is actually twin chip, rather than combined into a single die. This should hopefully allow us plenty of overclocking as the graphics heat wont be directly affecting the CPU die. It also, as with all 32nm Intel chips, has the new AES instruction set we first saw on the 980x. In fact the only difference is that the 655K has an unlocked multiplier.
The i7-875K is identical to the i7-870 that is the heart of our LGA1156 test system here at OC3D towers, but in a similar way to the 655K the difference is that it has an unlocked multiplier. Intel haven't adjusted anything else at all so it's still a hyperthreaded quad, on 45nm without the new AES instructions.