Why this Asus B250 is MUCH faster than Asus Z270?

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ben.jiang

May 9, 2018
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So I tested our in-house developed (very CPU intensive) app on several different Asus motherboards:
My test was simple: install the whole stack on one system and only swap the motherboards between tests. So the same CPU (i7 7700k), ram (32Gb G.SKILL Aegis 2400) and hdd (WD RE) were used. No GPU was used for the tests (our code doesn't use GPU). Also, during first batch of tests, no overclocking was enabled with Z270, so the CPU was running at 4.2Ghz (4.5 turbo) and ram was running at same speed. Mining Expert uses three PSUs, but the main PSU was used for the other two boards. The performance results were surprising: the Mining Expert is constantly MUCH MUCH faster. To be more specific, for same block of data, Mining Expert uses half of the time required for Z270-WS and B250M-A!

This is quite unexpected. So I decided to overclock Z270 and brought the CPU to 5.2Ghz. This closed the performance gap a little, but Mining Expert was still faster than 30~50%. I then gave Z270 better RAM (G.SKILL DDR4 3866) and overclocked the memory to 3333Mhz. This only brought Z270 performance slight closer to Mining Expert, but Mining Expert was still faster than ~20%.

Anyway, this puzzles me quite a bit. Consider the marketing material saying the Z270-WS board uses not only better chipset, but also "premium" capacitors and I also was overclocked it much faster... I have considered the following factors:

  • > Mining Expert uses three PSU, so the power is much more stable?
    > Mining Expert has only two memory lanes? (this seems laughable, I know).
My goal is to find the fastest motherboard as the Mining Expert, but does not require three PSUs (and does not need overclock). Any thoughts on why Mining Expert is much faster, or what board would satisfy my goal?
 
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Z
one reason that i could think off, is that they can cut down lots of io features and dedicate them to the pci-e lanes.

less feature means that CPU can spendless resource monitoring them.

i don't hink 3 atx pin helps, CPU has it's dedicated power from the 8 pin connector. also you can try to only power the board with 1 psu (top one), i think it should work, however tho most of your pcie at the bottom won't be powered.

two memory lane do help with overclocking, but only when you trying to squeeze the system hard to notice the difference.

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zyh1987

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Mar 16, 2018
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one reason that i could think off, is that they can cut down lots of io features and dedicate them to the pci-e lanes.

less feature means that CPU can spendless resource monitoring them.

i don't hink 3 atx pin helps, CPU has it's dedicated power from the 8 pin connector. also you can try to only power the board with 1 psu (top one), i think it should work, however tho most of your pcie at the bottom won't be powered.

two memory lane do help with overclocking, but only when you trying to squeeze the system hard to notice the difference.

 
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