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Can somebody confirm if the i5 3330 and i7 3770 have the exact same heat output?

hsjj3

Member
May 22, 2016
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In the other thread, I was talking about WD2 CPU optimization and someone told me it would be better to get a 3rd gen i7. I hadn't thought about that, but it sounds very economical.

I did some reading, and Wikipedia lists the i5 3330 and i7 3770 at 77W TDP.

Does this mean, when both processors run at 100% load with the exact same cooling solution (same heatsink/fan etc), they should roughly be at around the same temperature? Cause my i5 3330 with stock cooling currently runs at about 70C when gaming the latest games (up to 75C when I stress test the CPU only), I don't want to be in a position where I buy the i7 3770 and it ends up running at 80-90C.

Thanks!
 

AtenRa

Lifer
Feb 2, 2009
13,553
2,533
126
In the other thread, I was talking about WD2 CPU optimization and someone told me it would be better to get a 3rd gen i7. I hadn't thought about that, but it sounds very economical.

I did some reading, and Wikipedia lists the i5 3330 and i7 3770 at 77W TDP.

Does this mean, when both processors run at 100% load with the exact same cooling solution (same heatsink/fan etc), they should roughly be at around the same temperature? Cause my i5 3330 with stock cooling currently runs at about 70C when gaming the latest games (up to 75C when I stress test the CPU only), I don't want to be in a position where I buy the i7 3770 and it ends up running at 80-90C.

Thanks!
No, the Core i7 3770K has 4 more extra Threads (HT) + base and Turbo clocks are 500MHz+ higher than the Core i5 3330. So operating temperature when both CPUs at 100% load using the same Heat-Sink will be higher on the Core i7 3770K. Power consumption will be higher as well but not by much.
 

LTC8K6

Lifer
Mar 10, 2004
28,523
1,570
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All the specs seem to be the same as far as thermals, though. They likely shipped with the same heat sink.
 

LTC8K6

Lifer
Mar 10, 2004
28,523
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Tjunction is apparently 105C, so 80C is well within the safe range for these chips.
 

Phynaz

Lifer
Mar 13, 2006
10,143
816
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No, the Core i7 3770K has 4 more extra Threads (HT) + base and Turbo clocks are 500MHz+ higher than the Core i5 3330. So operating temperature when both CPUs at 100% load using the same Heat-Sink will be higher on the Core i7 3770K. Power consumption will be higher as well but not by much.
He said roughly. Also, if the power consumption is higher by "not much" then the temperature must be higher by "not much".
 

LTC8K6

Lifer
Mar 10, 2004
28,523
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The OP said 3770, not 3770K. I included the K just to show that it was also the same specs at the Intel site.
 

AtenRa

Lifer
Feb 2, 2009
13,553
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Core i7 3770 base = 3.4GHz vs 3.5GHz for the K model, both have the same Turbo at 3.9GHz. Thermal and Power differences between the two are insignificant.

Also, not by much means not the same. I dont believe i gave a direct number in either case but the fact remains the same, Core i7 3770/K doesnt have the same thermals/Power consumption as the Core i5 3330. But that doesnt mean the OP will have a problem if he will use a Core i7 3770/K with the same Heat-Sink as the Core i5 3330 since both have the same TDP.
 

ElFenix

Elite Member
Super Moderator
Mar 20, 2000
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TDP is a design target for maximum power dissipation over a relatively long period. It is not the necessarily the highest power consumption of the processor, nor is it necessarily the power consumption of a processor at a 100% load. 100% loads can vary, a processor with a 100% integer load will use less power than a processor with a 100% AVX load, because 100% load isn't necessarily using 100% of the processor's total resources. On top of that, while OEMs don't want to pay for heatsinks that offer way more cooling than needed, they also don't want to pay to design, validate, and stock too many types of heatsinks, so there is less granularity of TDP specifications than there might otherwise be. That is, each processor configuration and speed could have its own TDP, but they don't for money reasons.

That said, the power consumption of two processors from the same generation and of the same configuration will have the same power consumption when running the same load.

Note carefully that I said same load. Playing a Blu-ray is the same load because the decoding is paced at the same rate regardless of processor. Encoding a video is not, because the encoding rate will vary with the clock speed of the processor. Nor is playing a game which isn't FPS locked.

Since the OP is discussing a relative load (100%) between 2 processors of different peak clock speed and configuration (the i7 being hyperthreaded), the power consumption will not be the same.

In general, provided the same cooler, the one consuming more power will run hotter. But, cooling solutions are typically running with a variable fan setup to balance cooling needs with noise, so the 2 processors might run at the same temp anyway.
 
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