• Competitor rules

    Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

NVIDIA RTX 50 SERIES - Technical/General Discussion

I really dont understand the point of this new 12 pin power connector.

I assume that for every pin there is a positive and negative, so in a standard 8 pin connector there are 4 +ve and 4 -ve pins.

That means if the cards had used 4x 8 pin connectors there would have been 16 +ve pins and 16 -ve pins.

In this new connector we only have 6 of each, and they are smaller.

Even if using 3x 8 pin there would have been 12 of each pins.


If the card draws 600W at 12 V then that is 50 Amps.

Who decided it would be better to run 8.3 Amps per pin pair rather than say 3.1 Amps using 4x 8 pin cables or 4.2 Amps using 3x8 pins?

Even using 2x 8 pin would have given 8 pairs, so more than the new connector.
 
Jonnyfriendly said:
OK now Im confused - why would the CPU need two - there's only one CPU power socket on the motherboard? So should I use the 12vhpwr cable that came with the PSU or not - it says it's ATX 3.0 if that makes any difference? Thanks again for any help
Click to expand...
Your 5090 needs 4 so you still don't have enough. So you need to use the dedicated 16pin to 16pin cable that came with your PSU.
 
Murphy said:
IIRC it was originally meant to replace having three separate connectors.

Since then it seems to have morphed into replacing four connectors and now into replacing the sort of connector/cable you'd find attached to your car battery.
Click to expand...

A laudable aim Im sure but it cant even replace 2 x8pins at the same capacity can it?

2x8pin=16 pins (8 pairs) (and which are larger)
1x 12 pin = 12 pins (6 pairs).
 
Jonnyfriendly said:
And Im not running the risk of it melting/bursting into flames if I use the 16 pin thing ? A lot of videos and posts seem pretty alarming and I just want to use my expensive new GPU :cry:
Click to expand...
The adapter supplied with your gpu plugging into 4x pci-e cables is probably the least risk involved at this point in time-the only point of melting should be where the GPU power socket connects to the adapter.

Insane, but that's where we're at.
 
Ok my info is slightly wrong as the 8 pin connectors only use 3 pairs for power each.

So 2x 8 pin = 6 power pairs.
1x12 pin = 6 power pairs.


So Im still confused why the 12 pin is considered to be capable of transmitting more power? It doesn't make sense.

At best the 12 pin is equivalent to 2x8 pin, but if the 12 pin uses smaller pins then its still lower rated in my view.
 
Last edited:
129094.jpg


Hey guys I was just wondering if you think this is a suitable fire guard for my 5090? Obviously I think the big gaps will let air flow through well, but when it goes up in flames it could more easily spread to the rest of the house?

What you think ?










:p
 
Last edited:
danlightbulb said:
Ok my info is slightly wrong as the 8 pin connectors only use 3 pairs for power each.

So 2x 8 pin = 6 power pairs.
1x12 pin = 6 power pairs.


So Im still confused why the 12 pin is considered to be capable of transmitting more power? It doesn't make sense.
Click to expand...
Go back a few pages on here and I've linked the specs of both.

Basically the good old 8 pin is capable of 288w but was derated by a lot down to 150w for a bigger safety margin.

The 12v hpwr is capable of 684w but has been rated at 600w. Leaving not much margin for when things do go wrong
 
Well, I been talking to cablemod and I will say I was left a bit confused.

According to them, my cable “E-Series Pro ModMesh Sleeved 12VHPWR StealthSense” which I brought for my RTX 4090 FE a few years ago and is completely fine is not the same one you can order through there configurator, he went on to say “12V-2x6 connector features longer pins to ensure proper insertion and reduce the risk of overheating” and my original cable is not recommended.

Now it gets weird, the ones on the shop that are just default ones is the one I have now but was told to use the configurator to select 2x6pin for the 5000 series.

So going by that, the old cable and the ones available on the shop are the older ones but going through there configurator I could select 2x6pin for the 5000 series and is more expensive which I just ordered.

Will use the adapter what is supplied with the card until the new cable turns up around 6 to 8 weeks.

What a complete mess this cable spec is, just go back to the old plugs and be done with it.
 
Armageus said:
Go back a few pages on here and I've linked the specs of both.

Basically the good old 8 pin is capable of 288w but was derated by a lot down to 150w for a bigger safety margin.

The 12v hpwr is capable of 684w but has been rated at 600w. Leaving not much margin for when things do go wrong
Click to expand...

Paper specs are understood but they don't make sense.

Current flow is dictated primarily by wire gauge and surface area of the connector. A bigger connector is capable of more current flow its simple physics?

Both connectors (i.e 2x 8 pin or 1x 12 pin) have 6x power pairs, but the pins on the 12 pin are smaller, so how can it be rated higher?
 
Last edited:
Armageus said:
It's rated higher because they've pushed the "on paper" safe limit right up to the theoretical limit.
Click to expand...
Then they could have updated the spec of the 8 pin in the same way?

And still doesn't explain why it can replace 3x 8 pin or even 4 x 8 pin? 4x 8 pin would have given loads of safety margin on these cards.
 
Last edited:
Shaolin Chicken said:
I opened the SF1000 and it comes with two 8 pin connectors to 1 12V-2x6, there is no marking on the cable to designate H+ or H++.
Click to expand...

Yes, don’t worry. It doesn’t really matter if the cable is H+ or H++, because (for the cable) it’s the same thing, spec wise.

Anything that is now sold / marketed as “12V-2x6 / H++” will probably indicate it’s a ‘recent product’ and not some festering ye old cable made from time of the 40 series launch.

With regards to Seasonic and MSI, their ‘newest’ H++ cables have coloured ends. Even though they are still of the H+ spec (because there is no difference) these are undoubtedly the best cables you could use with PSUs from those brands. If you had a Seasonic or MSI PSU I would be telling you to definitely get one of these (i.e. if you had a 3.1 PSU but didn’t have one of these ‘newest cables’ already).

Looking at Corsair’s website, they don’t seem to sell ‘newer’ cables with coloured ends. It’s not the end of the world. Just have a look at your existing cable and check whether the pins look ‘okay-ish’ at the 12v end. If they do, you’re probably OK.

If the pins look a bit odd, buy a replacement and then use whichever of the two looks ‘the best’.
 
danlightbulb said:
Then they could have updated the spec of the 8 pin in the same way?
Click to expand...
Absolutely, but there were already low quality adapters, power supplies and cables out there that only meet the 150w requirement. You can't suddenly uprate a connector that's been out there for years.

You only have to look at the low quality mining risers etc that ignored even that spec and melted easily.

Edit:
As said earlier, why they didn't just make a 16 pin or whatever connector based off the 8 pin connector, god only knows.
 
Last edited:
I wonder what the AMD GPU team are thinking about all of this, i know AMD don't have a card than pushes nearly 600+ watts but i can imagine they won't be moving to this new connector anytime soon. if it aint broke don't fix it i say.
 
Armageus said:
Absolutely, but there were already low quality adapters, power supplies and cables out there that only meet the 150w requirement. You can't suddenly uprate a connector that's been out there for years.

You only have to look at the low quality mining risers etc that ignored even that spec and melted easily.

Edit:
As said earlier, why they didn't just make a 16 pin or whatever connector based off the 8 pin connector, god only knows.
Click to expand...

I was just going to say the same thing as your edit. Yes I agree, if a new connector is needed why make it so feeble as the 12 pin. Just make a full size 24 pin connector with 10 full size power pairs and 4 sense pins.
 
You must log in or register to reply here.
Back
Top Bottom