[Guide] Homebrew powered risers.

lbr

Anyone has any objections to the following -

Ideal riser should be

0*) PCIEx16 -> PCIEx1, cause mining does not require bandwidth and x1 link theoretically puts lower strain on the mg chipset/CPU.
Tho some motherboards will require presence shorting if x1 risers are used in x16 slots.

“cut” - to prevent current flow from/to motherboard voltage regulatorsPSU and to enable use of multiple PSUs
have thick enough wires on +12v lines, so they won’t burn, but not thick enough to cause significant voltage drop
all +12v lines shorted on the riser - to not overcurrent one pin only
wires soldered directly to slot

5*) +5v/+3v lines also going to PSU --> “ideally”

capacitors on +12vground, closer to load - better, HF fast capacitors, tantalum(?), solid(?), rating(?)
ground line also soldered and connected to PSU

Ideal multi-PSU

different PSUs +12v rails separated from each other
different PSUs +5/+3 rails separated from each other
3*) same PSU rails not mixing with each other
Properly synced - aka turning on/off at the same time

* does not really matter or not in the scope of the subject

ghostlander

[quote]6) capacitors on +12vground, closer to load - better, HF fast capacitors, tantalum(?), solid(?), rating(?)[/quote]

As for solid electrolytes, you want some radial ones probably. Nippon Chemi-Con PSC 270uF/16V (diameter 8mm) are a good choice. PSA or PS are older models with a little bit higher ESR. If you can get and fit Nippon PSC 470uF/16V (diameter 10mm), that’s even better. Sanyo solid electrolytes are more expensive usually unless you’re salvaging them from broken equipment.

lbr

[quote name=“ghostlander” post=“47275” timestamp=“1387875839”]
[quote]6) capacitors on +12vground, closer to load - better, HF fast capacitors, tantalum(?), solid(?), rating(?)[/quote]

As for solid electrolytes, you want some radial ones probably. Nippon Chemi-Con PSC 270uF/16V (diameter 8mm) are a good choice. PSA or PS are older models with a little bit higher ESR. If you can get and fit Nippon PSC 470uF/16V (diameter 10mm), that’s even better. Sanyo solid electrolytes are more expensive usually unless you’re salvaging them from broken equipment.
[/quote]

Thanks, I have a batch of Sanyo OS-CON, will use them.

mirrax

[quote name=“wrapper0feather” post=“45855” timestamp=“1387380800”]
Any chance this could be compressed into one page, I’ll edit into the pinned guide in mining, if required?

I found it confusing what was decided safe at the end. Possibly room for someone to do a Youtube / Blue Peter “video how to”.

I just use a riser, but I like to see steam punk solutions.
[/quote]
+1
Do this, this, this, end.
No opinions :)

lbr

[url=http://www.kitguru.net/components/power-supplies/zardon/silverstone-strider-gold-1200w-psu-review-sst-st1200-g/2/]http://www.kitguru.net/components/power-supplies/zardon/silverstone-strider-gold-1200w-psu-review-sst-st1200-g/2/[/url]
[img]http://www.kitguru.net/wp-content/uploads/2011/06/cables.png[/img]

jti8899

nutnut, rep for the post as it saved me a bunch of$$ on risers and I believe will end me with a better quality rig.

Suggestion for the next info post would be wiring of dual PS on a 4 card rig.

Thanks again
~//~

jewfromdahood

I’m curious do I still need to cut the cables to remove it from going back to the board. Because I plan on being able to have 7 AMD R9 280x GPU’s in one rig. 5 x PCI-E X16 powered riser and 2 x PCI-E X1 --> PCI-E X16 powered riser
Basically they are these ones [url=http://www.moddiy.com/products/PCI%252dExpress-PCI%252dE-1X-to-16X-Riser-Ribbon-Extender-Cable-w%7B47%7DMolex-%252b-Solid-Capacitor-%2830cm%29.html]http://www.moddiy.com/products/PCI%252dExpress-PCI%252dE-1X-to-16X-Riser-Ribbon-Extender-Cable-w{47}Molex-%252b-Solid-Capacitor-(30cm).html[/url] and their PCI-E X16 --> PCI-E X16 equivalent as well… Do I need to do any modifications to keep it from frying my board or no?
Also I have planned on two Silverstone Zeus 1,350 Watt PSUs for my rig how should I connect them all? Can I use one PSU for say the motherboard, HD, and such plus 3 GPU’s and their powered Risers and the other PSU to the other 4 GPU’s and their powered risers?