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Intel Core i7 4790 (Haswell Refresh) CPU and Z97 Performance Preview

By: Shawn Baker | Intel CPUs in CPUs, Chipsets & SoCs | Posted: May 6, 2014 4:31 pm



When it comes to the test system setup, we can't give too much away. What we can tell you, though, is that we've installed the i7 4790 processor into a new Z97 motherboard that will be launching next week. We've also got a bunch of processors in our graphs here today, but the two main ones we're going to be looking at today are the i7 4790 and i7 4770K. The other main thing worth noting is that we've retested the i7 4770K on our Z97 motherboard today.


Before we get into the performance side of things, there's a few things we should talk about with the i7 4790. The i7 4790 and i7 4770k share a lot of similarities. On the core front, both carry four cores, which is split into a total of eight threads. When it comes to L3 cache, both also contain 8MB. When it comes to the clock speeds, the i7 4790 sees a base clock of 3.6GHz, which is 100MHz up on the i7 4770K.


The Turbo frequency has also been bumped up 100MHz to 3.9GHz. Of course the big difference between these two chips is that the K series based chip brings with it an unlocked multiplier, which means overclocking is going to be significantly stronger.




On the topic of overclocking, we need to cover just how we went with our i7 4790. So, how did we go? We didn't! When it came to overclocking we managed to push the BCLK up to 104. The problem is that when at this speed our CPU wouldn't go to the 40x multiplier it's supposed to. The maximum speed it ran at was just over 3.9GHz via the 38x multiplier.


This is of course lower than stock turbo speed of 4GHz. We messed around with the settings in the BIOS, but didn't get anywhere. Of course it's important to note that we're still roughly a month away from the launch of these CPUs so we're more than sure this is an issue that will be fixed.


There's not too much more we need to cover. So saying that, I think we can wrap everything up now and move forward to see the performance of the new CPU.

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