i7 860 - 95W TDP?!?

[mmj_uk]

Is this right?

i5 750 2.66Ghz NO Hyperthreading = 95W TDP
i7 860 2.8Ghz Hyperthreading = 95W TDP
i7 920 2.66Ghz Hyperthreading = 130W TDP

How can the 860 have the same TDP as the 750 when it has extra load from Hyperthreading as well as being faster? (we've seen with i7 9xx series how much hotter a CPU runs with Hyperthreading) and also how does the 860 have 35W less TDP than the 920 when they are both almost identical? does the 860 run on lower voltage?

Maybe I don't understand it right but it seems strange to me, I thought TDP was reference to the amount of heat generated (and thus amount of cooling needed) by a chip is that not right?

 

[jbloggs]

Is this right?

i5 750 2.66Ghz NO Hyperthreading = 95W TDP
i7 860 2.66Ghz Hyperthreading = 95W TDP
i7 920 2.66Ghz Hyperthreading = 130W TDP

Yes, that's right, hence why I'll go for an 860 which has a lower TDP than the 920 (so should get better o/c), as regards the finer details, I'll let someone else explain...

 

[mmj_uk]

Yes, that's right, hence why I'll go for an 860 which has a lower TDP than the 920 (so should get better o/c), as regards the finer details, I'll let someone else explain...

hmm.. you haven't really answered anything how is it possible? the QPI link on 920 can't account for 35W surely? is the 860 on a smaller process? lower voltage? what?

 

[PermaBanned]

There's more to manufacturing than meets the eye. There could be smaller cache chips, different placement, more efficient silicon... either way you can't account for everything with specs.

 

[Temi_D]

i think its because of the Turbo feature that auto overclocks the,

 

[nightmare99]

The TDP is the thermal design power with the value being the max power draw, I fully expect the 750 to use a little less power than the 860.

 

[EsaT]

More than anything else TDP is for brand PC makers so that they can select "CPU class" (low end/mainstream/performance/high end) and design cooling once and then change easily between CPUs of that/lower class without redesigning cooling.

 

[mmj_uk]

Well looking at the i5 overclocking done by OCUK (on rather extreme cooling) they don't seem to run much cooler than i7 9xx.

It's a bit baffling really.

 

[jbloggs]

Well looking at the i5 overclocking done by OCUK (on rather extreme cooling) they don't seem to run much cooler than i7 9xx.

It's a bit baffling really.

Clear as mud!