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Will the real EPS12V please stand up? - Alex Belits
abelits
abelits
Will the real EPS12V please stand up?

ATX12V:

This is how a standard ATX12V power supply looks like.

20-pin connector:

1  +3.3  Orange
2  +3.3  Orange
3  GND   Black
4  +5    Red
5  GND   Black
6  +5    Red
7  GND   Black
8  PW-OK Gray
9  +5SB  Purple
10 +12   Yellow
 ---
11 +3.3  Orange
12 -12   Blue
13 GND   Black
14 PS-ON Green
15 GND   Black
16 GND   Black
17 GND   Black
18 
19 +5    Red
20 +5    Red

4-pin connector:

1  GND   Black
2  GND   Black
 ---
3  +12   Yellow
4  +12   Yellow

Zippy P1L-64xxP, configured for Tyan S2462:

This is what I have received from Zippy, and what works perfectly with older Tyan boards. Apparently, this is ATX-GES.

24-pin connector:

1  +5    Red
2  +5    Red
3  GND   Black
4  GND   Black
5  PS-ON Green
6  GND   Black
7  +3.3  Orange + Orange
8  +3.3  Orange
9  GND   Black
10 GND   Black
11 +12   Yellow
12 +12   Yellow
 ---
13 +5    Red
14 +5    Red
15 GND   Black
16 +5SB  Purple
17 -12   Blue
18 GND   Black
19 +3.3  Orange
20 +3.3  Orange
21 +3.3  Orange
22 GND   Black
23 GND   Black
24 +12   Yellow

8-pin connector:

1  +5    Red
2  PW-OK Gray
3  GND   Black
4  GND   Black
 ---
5  GND   Black
6  +12   Yellow
7  +12   Yellow
8  +12   Yellow

Sparkle FSP400:

This is what Sparkle makes, and I think, it should work with Tyan S2469, considering that it copies 10 pins on each 12-pin side from the the ATX12V 20-pin connector, and 2 pins on each 4 pins side from ATX12V 4-pin connector. I guess, this is what is called EPS12V.

24-pin connector:

1  +3.3  Orange
2  +3.3  Orange
3  GND   Black
4  +5    Red
5  GND   Black
6  +5    Red
7  GND   Black
8  PW-OK Gray
9  +5SB  Purple
10 +12   Yellow
11 +12   Yellow
12 +3.3  Orange
 ---
13 +3.3  Orange + Brown
14 -12   Blue
15 GND   Black
16 PS-ON Green
17 GND   Black
18 GND   Black
19 GND   Black
20 -5    White
21 +5    Red
22 +5    Red
13 +5    Red
24 GND   Black

8-pin connector:

1  GND   Black
2  GND   Black
3  GND   Black
4  GND   Black
 ---
5  +12   Yellow/Black
6  +12   Yellow/Black
7  +12   Yellow/Black
8  +12   Yellow/Black
Now the questions are:
  1. Why the 24-pin connectors on both new and old Tyan boards are exactly the same yet completely incompatible? Is it so difficult to ask Molex (or whoever) to make another pattern of the keys?
  2. Why the S2469 manual says that ATX-GES is incompatible, and the original pinout is mentioned as ATX-GES everywhere but in the Tyan's own docs for older boards on their web site?
  3. This page mentions both formats, and is apparently right, however this one seems to label EPS12V as ATX-GES, and the other two connectors look like nothing I have ever seen. Am I correct that the first page is right, and the second one is wrong, or is there something more to this? What are the "other two" anyway?

Current Mood: bitchy bitchy

2 comments or Leave a comment
Comments
dk379 From: dk379 Date: May 10th, 2004 02:06 am (UTC) (Link)
i think the only reliable way to find out is to go to Fry's and buy one of those, then catch a Tyan engineer just before lunch hour, and bribe him with free lunch into explaining this (bring the board and supply as an illustration.)
You can teturn parts afterwards, as usual.

by the way -- what do you think of this
ATX blade server?
abelits From: abelits Date: May 10th, 2004 07:28 am (UTC) (Link)
Right now I am too far from both Fry's and Tyan, so I had to resort to checking the traces on the motherboard. This confirmed that the third version is indeed EPS12V (or whatever is called "EPS12V" in the manual).

As for ATX blade, I have seen that design, but the only benefit is that they can use larger power supplies, and achieve a slightly higher density than traditional 1u (but still half the density of blades). Two motherboards per 1u would get almost the same density as blades (though some vertical space will have to be spent on power supplies and fans) and same flexibility (no predefined vertical size of the enclosure) as a traditional 1u.
2 comments or Leave a comment