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Is this PSU Haswell compatible? (Seasonic 300W)

post #1 of 7
Thread Starter 

Hi all, I'm looking to upgrade a computer to a Haswell based machine.

 
The current power supply is a SeaSonic SS-300TFX 300W PSU. (Newegg link: http://www.newegg.ca/Product/Product.aspx?Item=17-151-090 ) I've checked and can't seem to find anywhere saying it will work with Haswell, but then again I can't find anywhere saying it won't work with Haswell. If someone can confirm for me, or teach me how to determine whether a PSU is Haswell compatible or not, I'd really appreciate it.
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post #2 of 7
Probably not, would it affect it? Who knows.
Here's a little info on "Haswell compatible" power supplies
    
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post #3 of 7
Its not showing up on the list here:
http://techreport.com/review/24897/the-big-haswell-psu-compatibility-list

Additionally it isnt mentioned on the Seasonic webpage either. My guess is that its pretty safe to say that this power supply does not support Haswell. However, so long as you disable C6 and C7 power states in UEFI, you shouldn't run into any issues.
post #4 of 7
Kinda offtopic but im confused, why wouldn't a power supply be compatible anyway?
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post #5 of 7
Quote:
Originally Posted by damnwebsite View Post

Kinda offtopic but im confused, why wouldn't a power supply be compatible anyway?

Haswell CPUs have new power states, C6 and C7 which are not compatible with all PSUs.
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post #6 of 7
Quote:
Originally Posted by damnwebsite View Post

Kinda offtopic but im confused, why wouldn't a power supply be compatible anyway?
Quote:
According to Intel's presentation at IDF, the new Haswell processors enter a sleep state called C7 that can drop processor power usage as low as 0.05A. Even if the sleeping CPU is the only load on the +12V rail, most power supplies can handle a load this low. The potential problem comes up when there is still a substantial load on the power supply's non-primary rails (the +3.3V and +5V). If the load on these non-primary rails are above a certain threshold (which varies by PSU), the +12V can go out of spec (voltages greater than +12.6V). If the +12V is out of spec when the motherboard comes out of the sleep state, the PSU's protection may prevent the PSU from running and will cause the power supply to "latch off". This will require the user to cycle the power on their power supply using the power switch on the back of the unit.

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post #7 of 7
Thread Starter 

Thanks for the input guys! +Rep for the advice.

 

I went to the compatibility list, and Cooler Master says if you have a fan plugged into the PSU the low power state should work with any PSU. I guess that's something to try but for now I think I'll purchase the parts and just disable C6 and C7.

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CPUMotherboardGraphicsRAM
i7 2600k ASUS Sabertooth Z77 Sapphire 290 Tri-x 4GB OC CORSAIR Vengeance 16GB 
Hard DriveHard DriveHard DriveOptical Drive
Intel 520 120 GB SSD Seagate Barracuda 1 TB 250GB Samsung 840 EVO SSD LG Blu-Ray Lightscribe Combo Burner 
CoolingOSMonitorPower
Swiftech H320 (CPU only) Windows 7 Ultimate 27" Shimian 1440p Monitor 1000W Corsair PSU 
CaseMouseMouse PadAudio
800D custom painted and fixed up! 15 year old Microsoft Custom Minecraft Mousepad Logitech 2.1 Speakers (wub wubbity wub wub) 
CPUMotherboardGraphicsRAM
i5 3570k MSI Z68 MA-ED55 MSI GTX 750 Ti 6GB Corsair XMP 
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500GB WD Blue ASUS DVD Burner Hyper 212+ Windows 8.1 
PowerCase
Rosewill HIVE 750W Rosewill Blackbone 
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AMD Sempron 145 Gigabyte 990FXA-UD3 4x MSI GTX 750 Ti 6 GB Corsair XMP 
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500 GB Seagate Barracuda Stock Windows 7 LG 20" 900p display 
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Dell generic Rosewill HIVE 750W Rosewill Thor V2 Dell generic 
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4x USB Powered Risers 
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Number Cruncher
(16 items)
 
HTPC
(11 items)
 
750TIMINER2
(15 items)
 
CPUMotherboardGraphicsRAM
i7 2600k ASUS Sabertooth Z77 Sapphire 290 Tri-x 4GB OC CORSAIR Vengeance 16GB 
Hard DriveHard DriveHard DriveOptical Drive
Intel 520 120 GB SSD Seagate Barracuda 1 TB 250GB Samsung 840 EVO SSD LG Blu-Ray Lightscribe Combo Burner 
CoolingOSMonitorPower
Swiftech H320 (CPU only) Windows 7 Ultimate 27" Shimian 1440p Monitor 1000W Corsair PSU 
CaseMouseMouse PadAudio
800D custom painted and fixed up! 15 year old Microsoft Custom Minecraft Mousepad Logitech 2.1 Speakers (wub wubbity wub wub) 
CPUMotherboardGraphicsRAM
i5 3570k MSI Z68 MA-ED55 MSI GTX 750 Ti 6GB Corsair XMP 
Hard DriveOptical DriveCoolingOS
500GB WD Blue ASUS DVD Burner Hyper 212+ Windows 8.1 
PowerCase
Rosewill HIVE 750W Rosewill Blackbone 
CPUMotherboardGraphicsRAM
AMD Sempron 145 Gigabyte 990FXA-UD3 4x MSI GTX 750 Ti 6 GB Corsair XMP 
Hard DriveCoolingOSMonitor
500 GB Seagate Barracuda Stock Windows 7 LG 20" 900p display 
KeyboardPowerCaseMouse
Dell generic Rosewill HIVE 750W Rosewill Thor V2 Dell generic 
Other
4x USB Powered Risers 
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