- Category: Gigabyte Z87X-UD3H Review
- Published on Tuesday, 06 August 2013 01:41
- Written by Mike-Editor
Test setup and Configuration we have two new parts,
1. Diamond Multimedia HD7970 which replaces the GTX 570 in the test bed.
2. Corsair Dominator Platinum 2666C10(4x4GB) kit which only 2 sticks are used and 1600mhz 9-9-9-24 T1 is set.
(Z87X-UD4H review incoming and the heatsinks match the red of the DMM HD7970 pretty well)
Overclocking CPU and Memory:
However while the tests are run at 1600mhz memory to standardize, for OC performance below it is set at XMP(2666mhz) which it ran with all 4 sticks, all I set was XMP, I didn’t even set the divider and it went to 2666C10 with proper timings. That is how one should set XMP on GIGABYTE Z87 boards, as setting the divider will engage divider "auto rule timings" which will over-ride XMP specs. So ONLY set XMP if you want XMP, if that doesn't work then set the divider manually. I like to always set vDIMM myself to 1.65v(as per XMP of this kit).
Just a quick 4.5ghz run with 16GB of memory at 2666C10, the trick is that the Uncore auto increases to 40X and this can hurt memory OC, even at 4.5ghz setting 36x uncore to get higher memory clocks helps. If you leave uncore speed at default 35x it will turbo to 40x, so be mindful of this, it can cause higher rated memory kits to fail at XMP just because Uncore affects memory stability as well when you are trying to do both CPU and memory OC. You ca increase vRing to counteract this, but it will add heat, and I jut wanted a quick run. The performance hit for Uncore is very low when you OC on air, as long as you keep it around 35x-40X for 4.5ghz CPU speed you should be good. You need to weigh whether higher CPU OC and Memory OC outweigh higher uncore OC, and 98% of the time they will heavily outweigh uncore OC. We are just lucky Intel decided to unlock it!
Max OC of 5.15ghz at only 1.368v, just to see. I can push to 5.2ghz but requires more volts of course and showing 5.2ghz on air at 1.5v isn't very impressive.
Here we see that this samsung kit even at 16GB can boot at 29.33x divider with auto timings(with all 4 DIMMs mind you!), I didn’t touch these timings, just set 29.33x and high vDIMM(samsung can take over 2v on air for quick runs). I also found the max clock of all 4 DIMMs of the double sided samsung below, close to 3ghz. All on air.
Not bad for 4DIMM Samsung OC with 29.33x divider without any optimization other than vDIMM.
This is high BCLK of the UD3H with BIOS F6, I am pretty sure this is not possible on F5, but F5 has 1.67x divider working with 8x memory divider (due to special BCLK training which allows this kind of BCLK with stability!) . F7 BIOS should provide 1.67x support with this kind of BCLK, on F6 I tested I can do 118.7mhz*1.00x or 118mhz*1.25x (which is high enough for memory frequency WR). BCLK is useful for memory OC over 4ghz b/c the max multiplier for memory is only 29.33, so one must use 118mhz BCLK with 1.25x divider with 29.33x to get the WR for memory OC. Otherwise BCLK has little to no uses, other than 1.25x might be better on some CPUs for CPU and even memory OC. Just like with X79 I see that some CPUs prefer 1.25x divider opposed to 1.00x and might require less vcore with use of 1.25x divider.