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haswell input power problem?

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#1
hello fellas, I've been trying to increase the frequency of my haswell, but something funky is going on (I think)
all the way up to 4600 mhz for every voltage I increase the core the same increase in vIN stabilizes it.
but here is the problem, I think: while for 4600 mhz I manage to get along with 1.67 vIN, for 4700 mhz even 1.9 appears to be insufficient
the mobo is far from steallar (asrock z87 e3, it use 3pin mosfets for cpu power) but the whole thing is on water so mosfets on water (50 C) cpu on water (at 4700 1.35v could get to 80C)
what do you think ? limit of the power system ?

I try increase/decrease the vcore but here is what is hapen: when decrease below 1.34 it BSOD verry fast (interrupt was not received within the necessary time on the secondary processor). when increase above 1.35 is also BSOD fast with the same message. it managed to last for about an hour or two at 1.34/1.35.

I try 1.36v with 2.0v input, it BSOD in 50 minutes

im testing with old version of prime95 which is without AVX using the small FFT mode
 
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#2
The first thing that the boffins will ask you is to fill this out - System spec.
 
Joined
Oct 14, 2017
Messages
80 (0.15/day)
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System Name Lightning
Processor 4790K
Motherboard asrock z87 extreme 3
Cooling hwlabs black ice 20 fpi radiator, cpu mosfet blocks, MCW60 cpu block, full cover on 780Ti's
Memory corsair dominator platinum 2400C10, 32 giga, DDR3
Video Card(s) 2x780Ti
Storage intel S3700 400GB, samsung 850 pro 120 GB, a cheep intel MLC 120GB, an another even cheeper 120GB
Display(s) eizo foris fg2421
Case 700D
Audio Device(s) ESI Juli@
Power Supply seasonic platinum 1000
Mouse mx518
Software Lightning v2.0a
#3
done, thank :)
 
Joined
Oct 14, 2017
Messages
80 (0.15/day)
Likes
11
System Name Lightning
Processor 4790K
Motherboard asrock z87 extreme 3
Cooling hwlabs black ice 20 fpi radiator, cpu mosfet blocks, MCW60 cpu block, full cover on 780Ti's
Memory corsair dominator platinum 2400C10, 32 giga, DDR3
Video Card(s) 2x780Ti
Storage intel S3700 400GB, samsung 850 pro 120 GB, a cheep intel MLC 120GB, an another even cheeper 120GB
Display(s) eizo foris fg2421
Case 700D
Audio Device(s) ESI Juli@
Power Supply seasonic platinum 1000
Mouse mx518
Software Lightning v2.0a
#4
I think it's a cooling limit, I had it running for some time on prime small up to 74 C no problem (4600 mhz, 1.3v), started a game the card heated the loop flipped him into 80 C and BSOD :x it also explain whay 4700 mhz take time to BSOD after 50 minutes

im out of liquid metal, if I remove the water block from the cpu the pressure will damage the ultra won't it ? even if the lid is still closed
do you think if I replace MX4 between ihs and block with kryonaut 12.5 it will give a significant improvement ?
 
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#5
The CPU just isn't binned high enough, you're hitting a voltage wall. An example of this would be like trying to OC a Ryzen, no matter how much voltage you throw at it won't go over 4.2-4.3
 
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