Tyan Server MB - Power Supply

Koe

n00b
Joined
Jan 4, 2019
Messages
5
Hello,

I got a Tyan S7012 - Manual here.

On Page 33 is written follow:

NOTE
: Please be aware that ATX 2.x, ATX12V and ATXGES power supplies may
not
be compatible with the board and can
damage the motherboard and/or CPU(s).


What does this mean ? Im using a Seasonic Prime 1300W Platinum. Specs here.

The Problem is that the Mainboard doesn't properly turn on. If the powersupply doesn't have the main cable inserted for 5mins and i turn it on it the Mainboard starts. Everything is fine. But if i turn it off with the mainboard-header(Push-Button) and turn it on again, the fan spins for maybe 0.5 seconds and then nothing lights up. It seems like the Powersupply turns on and off. If i clear CMOS it works then too. BIOS is the latest revision. I flashed it.

I have only the Mainboard and PSU attached. Nothing else.

What could be the issue here ?

Regards,
Koe
 
Last edited:

H2R2P2

Limp Gawd
Joined
Jun 18, 2006
Messages
412
What I am assuming the manual means is that not all variants of those power supply standards listed may have a 24 pin connecter with *2x* 8 pin CPU power connectors. If you run it on a power supply with only 1x 8 pin, you may cause damage to the power, CPU, power supply, etc. The one you listed should work fine (from what I can tell from the info you provided).

Do you have a PC speaker hooked up? If so, do you get any beep codes when you turn on the motherboard?

If I were you, I would install the CPU's, ram, and video and see if the system posts. You aren't risking anything at this point as if the motherboard were bad in a way that was going to explode or something, it would have already done that by your turning it on. Adding the base elements to get the system at least to a point where you get beep codes or some sort of video is totally reasonable at this point.
 

Koe

n00b
Joined
Jan 4, 2019
Messages
5
Do you have a PC speaker hooked up? If so, do you get any beep codes when you turn on the motherboard?

That is the point. if the MB has no power connected for maybe 5 minutes it posts fine. But after that i don't get any beep or post codes. It turns a short time (0.5s) on than instant off.
The case fan tries to spin, but halts instant and shuts then off. I only have a green blinking light under the PCIE3 (Manual Page 10). But in the Manual i find no information about that LED.
Link to Picture.

PS: This system Mainboard and CPU are watercooled but i don't think this is a problem. The only 2 points that im not sure about are:

- Chasis Intrusion .. I don't find any default pinconfigurations for Chasis intrusion.
- CPU has no Fan connected ... so no signal and maybe doesnt boot because of that.

But this makes no sense if the MB boots if i don't connect power for 5 minutes.
 
Last edited:

H2R2P2

Limp Gawd
Joined
Jun 18, 2006
Messages
412
OK- so everything works fine with components installed until you turn the system off. Once that happens, the next power on gets you no beep codes with momentary power then full off.

Hmm.... Its possible you could somehow be tripping the power protection circuitry in the power supply. That is something that would clear itself by unplugging for a while. There is one other thing here...

I had the exact power supply you are using but was installed on a 1950x Threadripper. Everything worked fine, but if I had the system under sustained high load I would spontaneously lose all power except for standby voltage (ex: RGB lights on the motherboard would stay lit). The system would not power back on. The only way to "fix" it was to unplug the power supply for 5 mins or so. It would work fine again until I put it into sustained high load situations, then the same thing would happen again. I RMA'd the unit to Seasonic and they verified the unit was bad (it failed their testing). They sent me another one.. Same exact thing happened to me. I RMA'd that one, they found it to be bad, they sent me another one...

I ended up switching to an eVGA 1600W and have not had a problem since. I know Kyle had lots of issues with his Seasonic and Threadripper system too. Obviously your setup is quite a bit different but I think the Seasonic power supplies that use their new digital circuitry have some issues.

Do you have another power supply to try?
 

Koe

n00b
Joined
Jan 4, 2019
Messages
5
Do you have another power supply to try?


Really..... please nooo.... i bought this 2 days ago....
I used a Corsair AX850 and on this one it works fine.... I switched to a 1300W because i need the power.
(12 Harddrives + 2 System SSD + DVDRom + Radeon RX480 + DualCPU + Ram)

For what is the -12V Rail needed ? The Seasonic only provides 0.3A ... The AX850 provides 0.5A ?

PS: Im assuming its the Anti-Surge Protection.
 
Last edited:

H2R2P2

Limp Gawd
Joined
Jun 18, 2006
Messages
412
Yeah, I hate to say this but that Seasonic power supply is the problem.... The latest generation high end Seasonic power supplies are using a new digital circuitry design that is for all intents and purposes not playing nice with certain setups. Yours (and mine) are unfortunately ones affected......

Corsair and eVGA are really good options. Corsair also has a newer digital design but its not implemented in a way that will cause problems like the new Seasonics. Having said this, I have several 1500W Corsair and 1600W eVGA power supplies and have had the best luck with eVGA when they are pushed to their limits. Usually the eVGA's are a little cheaper than the Corsairs too.

Edit:

As for the negative voltages.. I am not entirely certain what they are used for in computers other than I know some OP Amps use them for various purposes. I know older computer power supplies (like AT and first gen ATX) had more (-) voltages, including -3.3v, but that was done away with when they started going to larger 12V rails. The majority of the voltages needed by the computer are derived via the motherboard via the 12V rail from the power supply. That's the most important voltage you need to be concerned about. Find the power supply that has the largest 12V amp rating from Corsair or eVGA you can afford and go that route.
 
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Koe

n00b
Joined
Jan 4, 2019
Messages
5
Im gonna buy the Corsair HX1200W because of the specs it delivers 30A on the +5V, +3.3V rail.
The EVGA only delivers 24A its maybe enough but the HX1200 is better for my purpose.
The 12V rail is not that important for me because i only create a storage server.

The powerup inrush current is the biggest problem in my eyes. To power up the DualCPUs Ram + 12 Harddrives needs alot of current when i start the system.

Thank you for your help.

Regards,
Koe
 

BinarySynapse

[H]F Junkie
Joined
Feb 6, 2006
Messages
15,103
Unless you're using only 2.5" drives, +12v is still important for storage servers.
E.g, the WD 8TB Red pulls 0.44a from 5v, but
it pulls 0.55a from 12v.


As for startup current, staggering your hard drive spinups will do a lot to reduce that.
 
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