*** Official Radeon HD5800 Series Overclocking Thread ***

[ieatrawbacos]

Ordered a 5850 yesterday, looking forward to seeing what it can do.

Please forget about Furmark.. for any and all reasons... as you said yourself, even the hardest hitting game at its highest settings doesn't put anywhere near the kind of stress+heat on it..

Which is exactly why it's a good stress tester. I always want to have some margins, so worst case scenario tests are a must.

[Migi06]

http://www.techpowerup.com/reviews/HIS/HD_5850/1.html

The GDDR5 memory chips are made by Samsung and carry the model number K4G10325FE-HC04. They are specified to run at 1250 MHz (5000 MHz GDDR5 effective). Those are the same chips like on the big brother HD 5870 - get ready for some serious overclocking.


The GPU voltage is managed by a Volterra VT1165MF voltage controller which is I2C capable enabling software voltmods.


The overclocks of our card are 835 MHz core (15% overclock) and 1260 MHz Memory (26% overclock). For your reference, the defaults are 725 / 1000 (GPU-Z is showing the wrong values due to a bug which will be fixed in the next version). As a percentage those overclocks are really nice. The maximum core clock of 835 MHz is clear evidence that this GPU ended on a HD 5850 because it could not handle the HD 5870 clock speeds of 850 MHz. The memory chips are exactly the same as on the HD 5870, which results in roughly the same maximum memory clock. In essence you can get a HD 5850 and overclock it to almost HD 5870 performance levels in just a few minutes. I would also like to point out that you can increase the voltage for better GPU overclocking. The default voltage of 1.09 V is quite low and there is plenty temperature headroom as well. So I ran a quick test at 1.30 V GPU and reached a maximum core clock of 1000 MHz.


5850 & Waterblock

[jaredpace]

Nice post^

Does the VT1165MF need to be cooled?

[Migi06]

Nice post^

Does the VT1165MF need to be cooled?

Dont thinks so.. If you look 5870 cooler it wont cool those chips:
http://www.techpowerup.com/reviews/A...ages/front.jpg
http://www.techpowerup.com/reviews/A...es/cooler3.jpg

[ieatrawbacos]

Anyone know if the Sapphire 5850 has the same Samsung memory ICs?

[jaredpace]

Anyone know if the Sapphire 5850 has the same Samsung memory ICs?

The answer to your question is 'yes' - 4 posts above and in the OP. Edit: just realized that you might be looking for clarification between brands. HIS, Sapphire, Asus, do they all have programmable volt-regs & 4.ns samsung 5gpbs ics? So far the answer is yes, since they all appear to be based on Ati's reference designed PCB.

[ieatrawbacos]

The answer to your question is 'yes' - 4 posts above and in the OP.

I realize that these are all reference cards and are likely to all use the same memory, but there have been exceptions in the past.

I don't see a Sapphire branded 5850 in the OP, and the post above my last is about an HIS card.

Just wondering if anyone had seen under the heatsink of a Sapphire branded 5850 and could confirm with 100% certainty that they also use the 1250MHz rated Samsung ICs.

[jaredpace]

Yeah i just realized you were talking about brands. I would say yes, but to be safe maybe we can wait for someone with a sapphire 5850 to tell us

[GLENBOY]

http://tpucdn.com/reviews/HIS/HD_5850/images/gpuz_oc.gif[/IMG]
The overclocks of our card are 835 MHz core (15% overclock) and 1260 MHz Memory (26% overclock). For your reference, the defaults are 725 / 1000 (GPU-Z is showing the wrong values due to a bug which will be fixed in the next version). As a percentage those overclocks are really nice. The maximum core clock of 835 MHz is clear evidence that this GPU ended on a HD 5850 because it could not handle the HD 5870 clock speeds of 850 MHz. The memory chips are exactly the same as on the HD 5870, which results in roughly the same maximum memory clock. In essence you can get a HD 5850 and overclock it to almost HD 5870 performance levels in just a few minutes. I would also like to point out that you can increase the voltage for better GPU overclocking. The default voltage of 1.09 V is quite low and there is plenty temperature headroom as well. So I ran a quick test at 1.30 V GPU and reached a maximum core clock of 1000 MHz.


5850 & Waterblock

now thats the info we've been waiting for on the 5850 5000mhz rated memory chips and a core with a bit of extra volts thats good for a 1000ish , excellent

[okorop]

this is my small oc testing the card 1010-1330
tomorrow I will continue from this point

[Oese]

this seems to work xD
http://gpuz.techpowerup.com/09/10/02/g3x.png

http://gpuz.techpowerup.com/09/10/02/59.png

[flopper]

now thats the info we've been waiting for on the 5850 5000mhz rated memory chips and a core with a bit of extra volts thats good for a 1000ish , excellent

it be a good monday

[Chickenfeed]

Holy god I managed to pwn my other score using just one card this time!

But how the hell are others breaking the 19k mark with one card?!

http://service.futuremark.com/compare?3dmv=1457343

P18058

My guess is over volting and 4.2+ i7s with HT enabled.

I'd honestly only regard the GPU score. As the CPU can inflate it a lot ( eg your total is 700 higher yet my gpu score is higher )

[ViRuS2k]

ATI power play working
Voltages working
Crossfire working

all done with this nice little MSI overclocking tool from the same maker of Rivatuner
to remove the GPU clocks limit you must flash the new released asus 1200/1400 bios.

[GLENBOY]

do you use the link button in the msi tool to overclock in crossfire so it overvolts all the cards

[wekktor]

how high vgpu can u use for 24/7 ? my maxtemp with 1.225v and 1000core is 55c.

[jaredpace]

your gpu & pwm has a thing called OCP that will shut your board down if you over heat it or overflow it with too much voltage Even so, i would stay under 1.30v - since that's the highest I've heard mentioned so far. Pretty soon someone will figure out the exact amount where over-volt protection and over-current protection initialize. Virus2k, a link to that asus 1200/1400 bios??

[wekktor]

so that means I cant damage the card because of too high volt?

I think it is this bios ?

http://techpowerup.com/vgabios/56695...24.090915.html

[jaredpace]

You can always damage your card, keep it reasonable, or read up on some of those support threads. Virus2k, that OC is really nice! :0

[lowdog]

ATI power play working
Voltages working
Crossfire working

all done with this nice little MSI overclocking tool from the same maker of Rivatuner
to remove the GPU clocks limit you must flash the new released asus 1200/1400 bios.

Hang on, how are you overclocking those Sapphire cards over the 900 core limit and CCC is showing 1200 core and 1400 mem limits

EDIT; okay see you have flashed to the Asus bios. Where is this bios available, is it the same one from techpowerup? also what program and paramaters are people using to flash the 5870, thanks.

[wekktor]

if you flash your bios to asus then it will be 1200/1400 limit. You can overclock in AMD GPU Clock Tool over yours limit(900) with your bios and then change the fanspeed and voltage in MSI AfterBurner but then the 2d clock doesnt work, but if u just want to benchmark or if you dont care about 2d clock mode then u can clock in amd gpu tool

[Oese]

curious which flashtool (atiflash doesnt work) too and which bios exactly.. the above posted?

[Oese]

ahhh atiflash 3.75 with -fs command does the job

[Oese]

asus bios ftw

stable with stock voltages... ram > 1325 decreases fps again....



stable with 1.25v gpu... (5 minutes tested..)

[Oese]

btw how hot do your vrm get under load? using gpu-z for readout?