Originally Posted by PontiacGTX
Do you plan on overclocking your cpu? Because that heatsink isnt good enough,which cpu is 150w?
Wait did he all a sudden decide to get something besides a i5/i7? Because you def can't say weather the heat sink will be enough until you install the CPU. I had an i7 that couldn't run at stock speed on the stock CPU with HT on and barely still with HT off and I had one that could run 4.4GHz on the stock CPU with HT off and 4.0 was no problem with it on.
Haswell is all over the place... I've had i5s that couldn't hit 4.4GHz on a top notch can't get any better water rig (unless you went below ambient) to 5GHz at 60C...
So I would wait till you have the actual chip before you decide as to if you can get by with a wimpy CPU cooler...
Also one of the reasons that the coolers go the extra mile with Haswell in comparison to other CPUs is with Haswell the CPU will function just fine in the 90s where as other CPUs you want to stay below 60C and with Haswell you can't break the CPU by overheating it as it will run to 105 with no problem and then not exceed it.
What this means is that the Heat Sink dissipates more heat because the metal of the heat sink is at a higher temp compared to the ambient than with other processors... It is not perfectly even as in since the CPU is 30C over another CPU the heat sink is because, if that was true the heat sink would be dissipating 2x as much heat as it would on other CPUs... and that clearly isn't the case... but the heat sink is hotter and therefore it is doing cooling more heat watts.
My suggestion is to get the chip first...
Turn off all the auto functions of the motherboard and start manually overclocking it at low voltages and seeing if you got one of the "good" chips.
Like I said the difference is SO extreme that I have had an i7 that could not run HT on the stock heat sink at all under a heavy load like encoding. It would throttle almost immediately! There are many things at play hear but part of it is the VID, part is how well the die wicks heat to the IHS, and there are other things at play as well since no 2 processors are alike.
Also what you need to run a stability test (which is great for testing OCs) and what you need to run the OC in normal programs are two completely different things. If your cooler can't handle running AIDA64 WHO CARES!!! stress testing blows for Haswell anyways... it can only prove your CPU is unstable and not that it is stable because plenty of people have learned that 24HR stable in stress testing doesn't mean anything once you load up Battlefield 4 and some other games.
I recommend that most people just do short stress tests 1 multiplier higher than they intend to run at until it is at least stable for a few minutes then drop the 1 multi and test it on video games or whatever they plan to run.
You are not going to break a Haswell...Edited by givmedew - 3/19/14 at 11:52pm