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Undervolting and underclocking 990FX - Page 2

post #11 of 13
Quote:
Originally Posted by CynicalUnicorn View Post

ASRock Extreme4 990FX. BIOS version is at least P1.80 because it supports Vishera but at most P2.00 because of the date purchased, plus I never updated. P2.00 BIOS adds support for 3300 series Opterons, a lineup that is 100% useless. FX does everything they do - including things like ECC - but with an unlocked multiplier.

Well poop. Does anybody know how much the northbridge draws in the first place with a single GPU and a couple SSDs? Reducing voltage from 1.2V to 1.1V would be a 16% power reduction, which ends up only being a couple watts here...

Well, i see your motherboard supports 8320E with BIOS 2.70.

http://www.asrock.com/mb/AMD/990FX%20Extreme4/?cat=CPU


If you don't have another CPU to flash the BIOS to 2.70 prior to installing the 8320E, you could email Asrock and ask what will happen if you install the 8320E with earlier BIOS. Since they are basically the same Vishera chips, maybe the motherboard will boot, but will simply use wrong voltages. If so, you can then flash the new BIOS and have it work normally.
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post #12 of 13
Thread Starter 
Okay, so what I've learned today is:
  • Vishera doesn't clock as high at ~0.9V as I was hoping
  • The northbridge can't be undervolted to a significant degree
  • My motherboard doesn't support ECC

In that case, Intel Avoton would likely do exactly what I need, but with ECC support and a GenuineIntel CPUID should that ever become a concern. I suspect performance is about the same. Silvermont is a bit slower than Jaguar, and two Jaguar cores are a bit faster than one Piledriver module per cycle, so clock-for-clock, a C2750 should match an 8320E.

Broadwell-DE also works but would be a bit more expensive. Perhaps if a 6-core version ever releases...
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For Sale: [FS] Z97 system: Xeon and RAM
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post #13 of 13
Thread Starter 
Bump because I still can't shake this idea. I've crunched some numbers, and I think a power consumption of 30W or less for both the CPU and the northbridge is possible. That's roughly what 8-core Avoton hits too. Combined with low-voltage, low-speed DDR3 and a 750Ti, I think a total system sustained peak of under 100W is possible.

It seems Vishera's TDP for at least the 8000 series does match its real power consumption. It'll be tricky, but it might just work. I think I'll place an order for an 8320E and see what happens.
Triumvirate
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For Sale: [FS] Z97 system: Xeon and RAM
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Corsair Dominator Platinum - 2x8GB Crucial M500 - 960GB Samsung 840 - 250GB WD Scorpio Blue - 1TB 
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ADATA SP900 - 64GB Scythe BIG Shuriken 2 Rev. B PNY Quadro 600 blower Windows 10 
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ASUS VE247H - 1080p Gateway FPD1960 - 1280x1024 Samsung S20D300 - 900p, portrait Rosewill RK9000I - Cherry MX Blue 
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Rosewill HIVE 650W Riotoro CR1080 SteelSeries Rival 100 CyberPower 1500PFCLCD 
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Triumvirate
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Osmium
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For Sale: [FS] Z97 system: Xeon and RAM
$160 (USD) or best offer
CPUMotherboardGraphicsGraphics
i7-5775C ASUS Sabertooth Z97 Mark 2 Sapphire RX 480 (reference) MSI Low-Profile 750Ti 
RAMHard DriveHard DriveHard Drive
Corsair Dominator Platinum - 2x8GB Crucial M500 - 960GB Samsung 840 - 250GB WD Scorpio Blue - 1TB 
Hard DriveCoolingCoolingOS
ADATA SP900 - 64GB Scythe BIG Shuriken 2 Rev. B PNY Quadro 600 blower Windows 10 
MonitorMonitorMonitorKeyboard
ASUS VE247H - 1080p Gateway FPD1960 - 1280x1024 Samsung S20D300 - 900p, portrait Rosewill RK9000I - Cherry MX Blue 
PowerCaseMouseOther
Rosewill HIVE 650W Riotoro CR1080 SteelSeries Rival 100 CyberPower 1500PFCLCD 
CPUMotherboardRAMHard Drive
AMD A10-7870K ASRock FM2A88X-ITX+ G.Skill Ripjaws X - 2x4GB @ 2400MT/s Samsung 840 120GB 
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