- Category: Gigabyte Z87X-UD3H Review
- Published on Tuesday, 06 August 2013 01:41
- Written by Mike-Editor
These are the heatsinks.
You can see there is very good contact between the VRM heatsinks and the board, you can even see the indentation of resistors as well as the PWM and one of the D720210 hubs, neither of which needs to be cooled, but they are because of the size of these heatsinks.
Now that the heatsinks are off we can see the board for what it is.
This is the motherboard block diagram, it might help when I discuss some things in this next section.
First off let’s postpone to take a look at the new 8 phase all IR VRM. There are no external drivers or doublers, and the PWM is an 8 phase PWM capable of extremely high switching frequencies which sadly are useless on this platform, the 8 phases should provide better thermals and ripple control just because of more true phases used. In fact if you look at the Ultra Durable 5+ lineup, they are almost guaranteed to use 8 true phases as GBT is only using an IR3563B. Since Intel integrated a secondary VRM, this VRM only needs to provide 1 input to the CPU, so no more 6+1 or 6+2 or 7+1 or 4+1(you get the idea) PWMs are needed. These chokes are the same used across the line, they aren’t the 60A chokes on the OC board or the past Ultra Durable 5 specification for Z77(the plus is the difference), but they should be capable of handling 30-35A which is more than enough for this platform as power consumption has gone down. Also the output voltage is higher than that of previous platforms, so the Duty cycle is also higher for Z87 and that means less general stress on the VRM, no more <10% duty cycles which put tons of strain on previous generation VRMs.
The PWM: IR3563B which is the latest VRD12.5 certified 8 phase International Rectifier Digital PWM capable of up to 2mhz switching frequency. That high switching frequency can be useful when you double phases as the switching frequency per phase is cut in half so this would allow a quadrupled VRM to run at a max 500khz per phase which is pretty high and would never happen.http://www.irf.com/product-info/datasheets/data/pb-ir3563b.pdf
The MOSFETs & Drivers: All integrated into the famous IR PowIRstages, based on the award winning (won an award for actually being able to do 60A on air) IR3550 which is a 60A capable part (50A at 90% eff.), the IR3553 is the capable 40A part which is pin to pin compatible with the IR3550, meaning you don’t need to change the PCB layout above to add in IR3550. Thus the IR3550 just has more surface area contact with the PCB which can sustain higher current output and at lower temperatures, but the truth is they(IR3550) cost an arm and a leg. So the IR3553 is the sensible part to put a board which has a cost under $400. It carries all the same technology as its famous big brother, while also performing well, with the ability to continuously output 25A at 90%, equal in power loss at 25A to the Texas Instruments NexFET D87350Dhttp://www.ti.com/lit/ds/symlink/csd87350q5d.pdf which is the competitor to the IR3553. This use of the IR3553 http://www.irf.com/product-info/datasheets/data/ir3553.pdf is very impressive at this price bracket, especially because the D3H uses them (same VRM actually on D3H and UD3H, almost same as OC board except for the lack of 60A chokes).
Capacitors: Eight 560uF 10K Black solid polymer low-ESR can-type capacitors are used on this board for everything: http://www.chemi-con.co.jp/e/tech_topics/pdf/new_cp_201304.pdf . The new way of rating capacitors is with higher temperatures, so these are rated to run 105C for 10K hours. ASUS also uses 10K capacitors of this type, but they only use them on their ROG boards, on their mainstream PZ87 boards they use 5K of the same rating (even the deluxe uses 5K).
Inductor: 0.5uH Ferrite core low DCR, not 60A like the Z87X-OC.
The results above of are a D3H, and I didn’t make these images, put I did compact the idle and load into one picture, the original article is here: http://pctuning.tyden.cz/hardware/zakladni-desky/27306-test-ctyr-desek-intel-z87-vcetne-mereni-termokamerou-ii?start=11
I have a buddy over from a Czech Site and he did a round up review with the D3H. What is significant is that the D3H has the same VRM, exactly as the UD3H. The boards compared against aren’t the same price range as the UD3H, but they just show differences in design, and you can expect the UD3H to act like that on FLIR test.
Ales "froxic" Kanak from PCTuning.cz online magazine
The memory VRM is a bit less impressive, however still pretty good. Memory doesn't take much power, so two real phases is pretty good. Its based on the IR3570A which is a 3+2 phase PWM, and uses Renesas MOSFETs K0393 for the low-side and K03B7 for the high-side switch.