Updating gpu - psu has a 6-6 pin, gpu wants a 6-8 pin, unsolvable problem ?

Hi Guys
Im thinking its time to upgrade my 560 ti, but I only have a 550 watt power supply(bronze80plus i think). The best candidate for my price range is the 760, it seems the 550 watt is alright but i wants a 6 and 8 pin connector while I only have a 6-6 pin.
is this an unsolvable issue ? I dont really want to go to the trouble of getting a new power supply right now

any advice guys ?

There should be adapters available but given your location I'm not sure where you'd have to order them from.

Here's an example on Newegg.

Ah, so i just need this small adapter thingy and its plain sailing ? The big discount electronics store near my house should have it then,

wow, looking at the store today I just realized that Kuroutoshikou video cards (very common in pc stores across japan) ...is actually Galaxy outside of Japan, I had no idea, i always saw them here and never on foreign websites and assumed they just didnt sell much outside of japan.

next question 2gb or 4 gb, price difference is about 60 usd.
my monitor is old, a 1680/1050 but i guess I will update to a more modern 1920/1080 sometime this year. I play skyrim with quite a lot of mods, civ 5, dodge a bullet by not getting ROME but if they fix it up i might get back into total war.

2Gb is fine for the vast majority of games right now, but with a lot of newer games that are probably going to be developed alongside the new consoles we're probably going to see higher VRam usage. For example, Battlefield 4 tends to exceed 2GB of usage if you turn the settings up. I would expect that to get more common as we get a ways into next year.

Whether it's worth it to you or not is kind of an individual thing, I think. You can always tweak settings like texture quality or anti-aliasing down a notch or two and reduce VRAM usage. It's just a question of how often you want to have to do that.

At face value, knowing the card has a 6-pin and 8-pin power connector, I would have said 550W is probably the absolute minimum PSU. After checking out a few reviews that talk about the card's power requirements, it really sounds like they could have stayed with a pair of 6-pin connectors and that 550W may be just fine.

So here's my understanding of how this works. The PCI-E slot on the motherboard can supply at most 75W. I believe that is baked in to the official PCI-Express specification. If a graphics card needs more than that - and most do - an auxiliary connector is required. A 6-pin auxiliary connector can supply up to another 75W of power. An 8-pin connector can supply up to 150W of power. So, totaling up what the card requires as connections, it may draw up to 75W (motherboard) + 75W (6-pin) + 150W (8-pin) or a total of 300W. Now, just because it could use that doesn't mean it actually will use that. That said, I've always assumed that a hardware manufacturer won't add extra cost components unless they are needed. Most of the manufacturers start with and often more or less copy Nvidia's reference design. Since Nvidia/they didn't feel that a pair of 6-pin connectors were sufficient, I would believe that the card is expected to require somewhere between 75W (motherboard) + 75W (6-pin) + 75W (the second 6-pin they didn't feel safe with) or 225W and 300W. That would be under full load of course. Add to that the power required by the CPU, the motherboard, disk drives, fans, etc. and you might easily be pushing 400W or more under load.

That's still under the maximum load of a 550W PSU, but most PSUs lose efficiency at 70-80% of their load. A 550W PSU would have a 70% load of 385W. You should be able to run 385W through there for long periods of time with no issues. That's assuming it's a decent PSU, and the manufacturer didn't just plain lie about it's rating. Unfortunately, there are some pretty shoddy PSUs out there there would burn up after a few hours of that load even if they are rated at 550W or more. Not knowing what you have specifically, I was a bit leery of just saying buy the adapter and be done with it. My personal target is to run a PSU at 50-60% of the rated load. They tend to last a long, long time that way.

However, I then looked at the power requirements from a few reviews. Here is one from Anandtech. That review gives the power requirements for the whole system, not just the GPU. There is another from Tom's Hardware. That one is supposed to include just the power from the GPU. And finally, one from the Guru of 3D, which has both the total load of the system and the estimated draw of just the card. All of those seem to indicate that the real world power consumption is way under the maximum the card is designed for. So much so in fact, I can't understand why a 6-pin and 8-pin were specified. It really looks like a pair of 6-pins was all that was necessary. It may be that Nvidia thought overclocking the GPU might push it over 225W. Or they are worried about the PCI-E auxiliary connectors on some (shoddy) PSUs not being up to the task.

So something along the lines of this adapter or this one should do the trick. Now, let's talk load balancing. If your PSU has a single 12V "rail," skip this. (See this site for a discussion of PSUs - turned to where rails are discussed.) For single 12V rail PSUs, it doesn't matter what connector you buy as they all draw from the same source. However, if your PSU has two or more 12V rails, it's best to try to distribute the load of that adapter over the least-loaded ones. Those tend to be the ones with Molex style connectors nowadays, but not always.

Sorry, if that's more of an answer than you wanted.

Thanks Capricorn1, more information is always better (unless it involves algebra,floating points or many world theories then my head begins to hurt)
Yes, it seems that when they 1st came out the 760 had 6-6pins, but now with the factory OC or ones with 2 cololing fans they have gone with 6-8pin.
It seems that Im ok, except I dont really understand the 12 rail business,

Info on my pc makers is a bit messy as all the documentation is in Japanese I have to rely on google translate to help me out.
This is my psu

Topower TOP-500D-B
Voltage range +3.3 V +5 V +12 V 1 +12 V 2 -12V +5 Vsb
Current 24A 24A 20A 20A 0.5A 2.5A
Combine at maximum output 130W 384W 6W 12.5W
485W 15W
Rated output 500W
Maximum output 550W
· 80PLUS BRONZE certification. High-efficiency power supply of more than 82% conversion efficiency.
· To improve the power factor "Active PFC circuit" deployment
· Even at low voltage stable operation (AC88 ~ 264V design)
· 105 ℃ electrolytic capacitor tolerance adoption. I realize a stable voltage
· Fan control function for large-diameter 120mm silent fan
Connector (maximum)
ATX 24/20pin One
ATX 4/8pin One
PCI-E 6pin Two
HDD 4pin Three
FDD 4pin One

oh, that copy and paste info came out pretty messy
http://www.tsukumo.co.jp/bto/help/de... and english translate and the info is under Topower TOP-500D-B

I have never encountered or even heard of load balancing issues on newer PSU's with systems that only have one videocard.

I'm sure it's possible to have it some other way but every time I've ever seen or read about that it's involved multi-gpu systems.

Not something I would worry about if I were you Browny.

Thanks ThinJ...to market i go!

OK, so the PSU you have has two +12V "rails" named +12V1 and +12V2. I would expect that they made it with one of the 6-pin PCI-E connector on one rail and the other 6-pin PCI-E on the other rail. Each rail has a maximum load/current rating of 20A. The power, in Watts is the current times the voltage or 12V * 20A = 240W maximum on each rail. Since the two +12V lines will also being powering things like the CPU, motherboard, hard drives, etc., not all of that rating is available for the GPU. I don't know anything about the Topower brand, so I have no idea if it's really capable of delivering 20A on those or not. If it is, you probably really don't have to worry that much about balance.