• 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.

How to overclock a 7850 past 1050MHz?

Menty said:
Tell your mate to connect both molex connectors.
The reason that 2 x molex to pcie connectors are supplied is to distribute the current through two sets of wiring not one!

If he has a 7850 no doubt overclocking is going to be on the cards so get that other molex connected or the worst case is the single molex wire will burn out.
Click to expand...

Ok now im confused as one of u guys say use one and ur telling me he needs to use both.. the card is a factory oc version at 950MHz core so can anybody else (hopefully someone with the same card) tell me the right way this card is powered cuz u know.. i dont wana ruin his card for him by giving him wrong info on how its meant to be set up.

Thanks so far for ur responses i appreciate it :)
 
If your friend has a 2 x molex to 6 pin pcie connector supplied with the graphics card use it properly and connect both molex to the psu as that is what they are designed to do.
A single Molex is not rated with the same capacity as a 6 pin pcie but the twin molex will be (and more).
You might get away with running the card for a while on a single Molex but the cable will get hot and ultimately (depending on the overclock/current draw) fail.

Telling someone to use a single Molex to 6 pin pcie is poor advise.
 
If your power supply is/will struggle to power a 7850 from a single molex then i think you have issues.
The chances are that the person will connect 2 molex plugs from the same lead anyway, so will be on the same rail, therefore will make no difference at all if one or two are plugged in.
 
MartynB85 said:
If your power supply is/will struggle to power a 7850 from a single molex then i think you have issues.
The chances are that the person will connect 2 molex plugs from the same lead anyway, so will be on the same rail, therefore will make no difference at all if one or two are plugged in.
Click to expand...

I'm not going to type the same thing for a third time.
Read both my previous posts and take in what I highlighted to be the main problem as so far you have not got it!
 
Tonester0011 said:
My brother must have one of the worst 7850s.

Cant get 1100 on the core. MSI TF4 PE if anyone was wondering, 1210mv for 1075core 1300 mem...Runs nice and cool, 60c on Heaven.

Tempted just to DSR it for another one.
Click to expand...

I have one of these too, it needs 1225mv to do 1150 core and isn't stable at 1200 unless I go to 1275mv. They aren't the best clockers at all, but you should be able to get to 1100 at least. Best thing about these cards is the cooler. Out of interest, what's your ASIC?
 
MartynB85 said:
What, the bit about the molex wires burning out lol. That isn't going to happen running a card like this. Chill dude.
Click to expand...

I'm not interested in making you look stupid that's not how I work, but after 28 years in the electrical industry credit me with having some insight.

Don't offer an uneducated guess, it's not your hardware is it?
 
Menty said:
I'm not interested in making you look stupid that's not how I work, but after 28 years in the electrical industry credit me with having some insight.

Don't offer an uneducated guess, it's not your hardware is it?
Click to expand...

You bite very easily.

I ran my 7850 on an old 400 odd watt psu, from one molex connector. I5, two mech hard disks and an optical drive. The 7850 had a mild overclock too. I had no wires burning, it ran like a charm, in fact I would have left it like that if the bearing wasn't noisy in the psu. It was easily 3 maybe more years old.

I don't discredit you at all, I'm just going from experience. I've worked in IT for nearly ten years and have been tinkering a few more.
 
I have happily run a 6850 (very similar power requirements to the 7850) within a Shuttle XPC for the past two years. It's puny 300W supply has also manages to handle a Q9450 processor in tandem with the 127W TDP GPU.

The 6850's and 7850's consume amazingly low power for their performance. I would guess that any reasonable 350W+ PSU could handle one, so long as other components are not power hogs.

One molex plug is more than sufficient to handle the max 75W (6 pin) or 150W (8 pin) load draw from a PCI-E connector, so long as the PSU has the oomph tp deliver the Ampage.
 
yeah these gpu's don't really need that much power, i also ran a 6870 in the same machine which i believe needs more power than 7850. I played many hours or bf3 on that until bought a 7850.
We have shedloads of machines at work that i can use to play around with, i've not burnt anything out yet....
For the record, yeah plug them both in, but both are not needed, i should have said that in my first post.
 
Just hit the 51% OC

87.2 asic
stock Voltage 1074v


Link
3D MARK SCORE - P7469
GRAPHICS SCORE - 7342
PHYSICS SCORE - 8199
COMBINED SCORE - 7441

Gpuz


414706e3_Untitled.png

I'm not getting good temps using 1.3v, highest temp 81c from running heaven & 3D mark 11 while fans are @ 100%

87b0e889_Undtitled.png

My airflows OK

1a3d4052_CameraZOOM-20120704191538924.jpeg
 
Last edited:
^^ Nice overclock, but this is what I get on a 1200/5440mhz overclock at 1.225v. Just 4 less FPS which isn't very noticeable at all. I'd scale the overclock back a bit to consume less power and produce less heat...

heaven2012090622070927j.jpg
 
I'm looking at getting one of these however on most benchmarks the 7870 seems to fly ahead in some games. I'm liking the look of the powercolor one which already comes at 1000mhz and got pushed to 1250mhz by one of the review sites.
 
This isn't really relevant to the thread but my friend bought himself a new PC (Alienware x51). Anyway he claims his GPU (GTX 555) is better than my Sapphire 7850 2GB, even though I've overclocked my GPU too.

is my card really inferior to his or is he being arrogant about his new PC?
 
Hello, a late 7850 buyer here.

Got the Sapphire non-OC version with dual fans, ASIC of 89,2%. I´m a bit disappointed, though. The best my card can do is 1100/5200 with 1.15V, max temp 68ºC on load, but its not rock hard stable and I´ve been using 1050/4800 with stock (1.138) voltage. No matter how much I up the voltage (went all the way to 1.225), it never stabilizes any extra push I make in either core or memory frequency and the Heaven benchmark freezes.

I know 1100/5200 is a good overclock comparing with the stock freqs, and I´m not using custom cooling, but with so many people easily reaching 1200 at core I feel a bit frustrated. Is there anything else I can try?
 
Last edited:
You must log in or register to reply here.
Back
Top Bottom