Overclocking
In the test, we also overclock the board by changing the BIOS options.
In our test, we only have the Core i7-4770 processor. As it is a non-K edition, the CPU Multiplier cannot be adjusted upwards beyond the turbo speed. So we can only set it to a maximum of 39X. In order to do so, you will have to turn off Ai Overclock Tuner and set it to Manual. We set CPU core Ratio to 39 and Sync All Cores.
Do take note that when you adjust the BCLK, the corresponding Target clocks – CPU, DRAM, Cache, DMI/PEG and CPU Graphics Speed will increase automatically based on a ratio. In this case, our CPU graphics speed is using a ratio of 28x. The cache speed is 39x.
Our overclocked speed is 4095 MHz (39 x 105).
In our test, we only change the CPU Vcore and Cache Voltage to 1.30v, likewise for Graphics voltage override.
The Max CPU graphics ratio is set to 28, giving us a Graphics clk at 1484/2 = 742 Mhz (default is 600MHz). The higher the ratio, the higher the graphics core clock and BCLK will have an impact on it.
For more options available in the BIOS, please check page 4 of this review or visit our youtube channel at http://www.youtube.com/ocworkbench
Running the graphics test at 1024×768 it was just to show how powerfull is the CPU.
In my opinion the good way would be to run all graphics test at hd resolution at 1280×800,
like in Unigine Heaven. Small resolution with reduced detail is no struggle for a nowadays decent gpu. This CPU-GPU pair from Intel supposed to be one of the first one with “GPU”. And the benchmark just simply missed this point. Make the vga work hard, yes also for the amd counterpart. Let we see what they can do if we go over the word/excel/powerpoint type of works. 100 fps is useless in excel.
Thanks for your response. Regarding Heaven Demo, it is tested in Basic mode which runs 1280×720 to test the internal graphics. Likewise we use the same method to test the AMD APUs e.g. A10-5800K
You ask why performance dropped with overclocking? One word: Throttling. Haswell gets very hot, you need excellent cooling if you don’t want throttling during OC!
You may be right but temperatures were ok. You don’t really need excellent cooling with this processor as 4.1GHz is really nothing compared to the 4770K running 4.7GHz on AIR.
If you look at it, when the BCLK is raised, the other clks like DMI are also affected. In fact, at certain CLK levels>100mhz, the DMI drops below 90Mhz. Don’t forget we applied a ratio to the graphics core. If graphics core is set to default, it might not have affected the processor’s performance.
Why even bother to test the 4770 along side with a i5 3570K.. not really any use since the 3570K is last gen and it is one model down at that too. more appropriate would be to use the i7 3770K as a point of reference for the 4770 as this will give a better review to if Haswell made any significant performance improvements in either processing power, energy savings,and video performance. Between the 3770K and 4770/k it seems more of a video improvement… at least on paper
Sometimes it just happens that you don’t have the processor on hand. You are right the improvement is more on the video and power.