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Question MSI 1660 Super power question (safe?)

-Adz-

Junior Member
Aug 18, 2020
7
0
6
Hi,
Would really appreciated some guidance on the following:

Bought a MSI 1660 Super to upgrade a bargain PC I got from work for gaming.
The PC has a weird PSU (685w) which has its own board, on that board there is an 8 pin power_VGA2 port, furthermore the PC came with a 8 [male] to 2 x 6 pin [male] connector currently unused, 2 pins on the 8pin side are also unused/ empty.
The 1660 Super has a 1x 8pin port.
I looked around and most cables out there are 8 to 6 pin connectors however I managed to find and buy a 1x6 [female] to 8 pin [male] adapter.

So I will end up with:
8 pin port on PSU board
Connected to:
8 pin (2 pins unused) to 2x6 pin connector
Connected to:
6 pin (1) to 8 pin adapter
Connected to:
8 pin port on 1660 supper

My question is:
Is this setup safe and will it provide enough power for the card (normal and overclocked states)?

Your help & time is much appreciated.
 

VirtualLarry

No Lifer
Aug 25, 2001
50,505
6,069
126
I would. Whether it's "safe" or not, you'd have to ask an EE, but I would personally feel OK doing it that way.
 

-Adz-

Junior Member
Aug 18, 2020
7
0
6
Is the PSU connection a standard PCIE connector?

If so, then why not just get an 8 pin male to male?

I wasnt able to find an 8m to 8m pin connector, only 6+2, 4+4 and 6.

the connector i currently have has pins 7 & 8 empty.

Here are some pics of the wiring and set up:

https://ibb.co/dKpJV71 (8 Pin port on 1660)
https://ibb.co/hmTXcMx (8 pin port on current 8 - 2x6 pin connection - 2 pins blank)
https://ibb.co/jMZGG5p (PSU card)
https://ibb.co/jzVbwPm (2x6 pin connection ports)
https://ibb.co/8NTGLjq (8 to 2x6 pin connection connected to PSU board)
https://ibb.co/dDntQd7 (Proposed layout)
https://ibb.co/K6bVysc (PSU card)
https://ibb.co/WKn0XQV (PSU sticker)
 

Stuka87

Diamond Member
Dec 10, 2010
5,332
1,102
136
I wasnt able to find an 8m to 8m pin connector, only 6+2, 4+4 and 6.

the connector i currently have has pins 7 & 8 empty.

Here are some pics of the wiring and set up:

https://ibb.co/dKpJV71 (8 Pin port on 1660)
https://ibb.co/hmTXcMx (8 pin port on current 8 - 2x6 pin connection - 2 pins blank)
https://ibb.co/jMZGG5p (PSU card)
https://ibb.co/jzVbwPm (2x6 pin connection ports)
https://ibb.co/8NTGLjq (8 to 2x6 pin connection connected to PSU board)
https://ibb.co/dDntQd7 (Proposed layout)
https://ibb.co/K6bVysc (PSU card)
https://ibb.co/WKn0XQV (PSU sticker)
6+2 is the same as 8 pin. Its just made universal so it works with a 6pin or an 8pin GPU.
 

EliteRetard

Diamond Member
Mar 6, 2006
6,460
1,003
136
I wasnt able to find an 8m to 8m pin connector, only 6+2, 4+4 and 6.

the connector i currently have has pins 7 & 8 empty.

Here are some pics of the wiring and set up:

*snip*
As Stuka87 said, a 6+2 pin PCIE is made to work with both 6 and 8 pin connectors.
The 4+4 pin are for CPU EPS connections, despite being 8 pin are not compatible.

Based on your picture it looks to me like the connector on the PSU side is an 8 pin PCIE.
The reason your current cable is "missing" 2 pins is because it's splitting out to 6 pin.
A 6 pin PCIE is rated for 75w while an 8 pin rated 150w, thus why they can split to two 6 pin.
No reason to bother with a nest of adapter cables, and there's a tiny bit more risk that way.

Something like this should work:

On this particular cable, the blue connector would connect to the PSU side.


I'll admit, it took a second to find a 1x 8 pin male to male at reputable site for a decent price.
There's more choices closer to $30 and/or from less well know retailers if you don't mind.

There's quite a few that go from 1x 8 pin to 2x 8 pin, and you could use just one of the connectors.
However, that leaves extra cable clutter and the temptation for somebody to use both 8 pin later on.
That PSU lists 18 amp max per "rail", 2x 8 pin could pull as much as 25 amp so it may not be safe.
Not all GPUs with 2x 8pin will max it out though, so it's up to you if you wanted to have that option.
 

-Adz-

Junior Member
Aug 18, 2020
7
0
6
As Stuka87 said, a 6+2 pin PCIE is made to work with both 6 and 8 pin connectors.
The 4+4 pin are for CPU EPS connections, despite being 8 pin are not compatible.

Based on your picture it looks to me like the connector on the PSU side is an 8 pin PCIE.
The reason your current cable is "missing" 2 pins is because it's splitting out to 6 pin.
A 6 pin PCIE is rated for 75w while an 8 pin rated 150w, thus why they can split to two 6 pin.
No reason to bother with a nest of adapter cables, and there's a tiny bit more risk that way.

Something like this should work:

On this particular cable, the blue connector would connect to the PSU side.


I'll admit, it took a second to find a 1x 8 pin male to male at reputable site for a decent price.
There's more choices closer to $30 and/or from less well know retailers if you don't mind.

There's quite a few that go from 1x 8 pin to 2x 8 pin, and you could use just one of the connectors.
However, that leaves extra cable clutter and the temptation for somebody to use both 8 pin later on.
That PSU lists 18 amp max per "rail", 2x 8 pin could pull as much as 25 amp so it may not be safe.
Not all GPUs with 2x 8pin will max it out though, so it's up to you if you wanted to have that option.
Will this be appropriate:

 

EliteRetard

Diamond Member
Mar 6, 2006
6,460
1,003
136
Will this be appropriate:

*snip*
If you look at the connector on your GPU and PSU, they look exactly the same...as does that cable.

I'm going to say yes, that looks like just what you need.

One thing to consider though, is that long enough to reach your GPU? 30cm is less than a foot.
Being handmade, I'd bet you could contact them to get just the right length (unless it already is).
 

-Adz-

Junior Member
Aug 18, 2020
7
0
6
If you look at the connector on your GPU and PSU, they look exactly the same...as does that cable.

I'm going to say yes, that looks like just what you need.

One thing to consider though, is that long enough to reach your GPU? 30cm is less than a foot.
Being handmade, I'd bet you could contact them to get just the right length (unless it already is).
Thats perfect, spoke to the supplier and i can get a 60cm.

Thank you so much for all your support.
 

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