Have 2 i7 DCs, must determine better chip.

[WCPredator]

Before I knew what I was doing (some more lol), I had an i7 that had a default Vcore of 1.3v (#!) RMA overnight for a new one, def. Vcore 1.264v (#2)

Any help to quickly determine the better chip would be greatly appreciated, thanks 😉 I have the under volt numbers for #2, now just need to hit the highs, and then test the other chip from scratch.

What is Bclock and why do high OCers raise it a bit?

[Quad5Ny]

BCLK or Base Clock is the clock that most of the components in the system derive their speed from. High OCers raise it because it offers much more fine grained control as opposed to multipliers and it allows them to squeeze a few extra MHz out of the chip.

For the cores it would be BCLKxCore Multiplier=Frequency. You normally don't want adjust it more than -/+ 2MHz. Although you can choose different straps/dividers that let you keep the PCIe bus and other buses/clocks at stable speeds. -- Example A: 100x44=4,400MHz (4.4GHz) | Example B: 102.3x44=4,501MHz (4.5GHz)

As for really quick testing... stick a good cooler on it and torture it with the latest version of Prime95 w/SmallFFT's.

If you want to go really crazy launch 2 copy's of P95 and have the first copy run on the real cores and the second copy run on the hyper-threaded cores (P95_1: Core0,Core2,Core4,Core6 | P95_2 Core1,Core3,Core5,Core7). - Don't actually do this it can't possibly be good for the CPU. 😉

[WCPredator]

I though prime95 overheated the haswells? I have the best air cooler. Will prime 95 show me numbers that will identify the better chip?

[NemesisChild]

WCPredator wrote:
I though prime95 overheated the haswells? I have the best air cooler. Will prime 95 show me numbers that will identify the better chip?

Only you can determine which is the better overclocking chip.

[Quad5Ny]

Prime95 uses AVX2+FME3 instruction sets and that overheated Haswell very quickly by adding 0.100V to the core voltage. Intel fixed the over voltage thing on Haswell refresh parts, Devil's Canyon only adds 0.02V. I mean DC still generates a lot of heat on Prime95 but as long as your under 85C I wouldn't worry.

Anyway I personally find Prime95 very useful as a quick check. If I can run 20min of P95 Small FFTs my core voltage is usually stable.

Edit: What is the undervolt for your 4790K? Mine likes a -67mV undervolt: VID is 1.172V@4.4GHz, 1.000V@4.0GHz and 0.646V@800MHz.