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XFX HD5870 Overclocking.

post #1 of 13
Thread Starter 
Have a lot of questions so I'll just get started!

Ok, first off, my specs (new rig):

AMD Phenom II X6 1090T Black Edition
(http://www.newegg.com/Product/Product.aspx?Item=N82E16819103849&cm_re=1090t-_-19-103-849-_-Product)

GIGABYTE GA-870A-UD3:
(http://www.newegg.com/Product/Product.aspx?Item=N82E16813128443)

XFX HD5870
(http://www.newegg.com/Product/Product.aspx?Item=N82E16814150476&cm_re=XFX_HD5870-_-14-150-476-_-Product)

4GB DDR3 G.Skill PI
(http://www.newegg.com/Product/Product.aspx?Item=N82E16820231351&cm_re=g_skill-_-20-231-351-_-Product)

- 700W quality Chieftec PSU
- Stock air cooling:
- NZXT TEMPEST EVO case
- 2x 120mm intake NZXT performance fans
- 2x 140mm exhaust NZXT performance fans
- 1x 120mm exhaust NZXT performance fan
- Stock clocks are:
Core = 800Mhz
Memory = 1200Mhz
The highest Overdrive or MSI Afterburner will let me go is 900/1300

What I need to know:

1. How far can I take this card on stock? The highest Overdrive or MSI Afterburner will let me go is 900/1300.

2. How do I unlock voltage modification? I've checked the boxes in Afterburner but it still wont let me modify it. :/

3. I'll be putting the card under water in a few months, so what is a good 24x7 clock until then?

4. How can I monitor power draw?

5. I'm using Furmark to stress test and here are my results, 900/1300 (max software allowed OC):

furmark_000000edit-1.jpg

Temp climbed to 77C and stayed there, FPS were: min 35, max 112, avg 72.
The fan was running like crazy, I'd say at least 70-80%.

That dip in temp. about halfway is a somewhat disturbing event. :/ Furmark showed me a screen full of vertical alternating orange-red lines for a few seconds. Right after I took that screenshot at 10:00 minutes and pressed escape to turn off Furmark my PC siezed up and I got a bluescreen. Since then I've gone back to stock. So:

5. What were those lines and why did Furmark show them?

6. Does the bluescreen mean the clocks are unstable?

7. Is 10 minutes enough to stress test the card?
Edited by dejanribic - 1/3/11 at 7:55am
post #2 of 13
Yup, the card failed to continue with that setting. I cant tell you how far you can push your 5870, but I do believe that the crash was due to one of the following reasons.
1. What PSU are you using? If the card doesnt get the necessary power, it will crash.
2. The clock speeds you are currently using needs overvoltings the gpu.
For that I could really use a screenshot of afterburner oc section.
    
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post #3 of 13
Thread Starter 
Will get back to you, pronto. Not on home PC atm. smile.gif

Thanks for the info!
post #4 of 13
Thread Starter 
Quote:
Originally Posted by leopold1985;11851440 
Yup, the card failed to continue with that setting. I cant tell you how far you can push your 5870, but I do believe that the crash was due to one of the following reasons.
1. What PSU are you using? If the card doesnt get the necessary power, it will crash.
2. The clock speeds you are currently using needs overvoltings the gpu.
For that I could really use a screenshot of afterburner oc section.

Here's my OC section of Afterburner, along with hardware monitor and settings. Also, just downloaded Sapphire TriXX 3.0.2 beta, it lets me overclock up to 1200 core (800 stock) and 1800 (1200 stock!!!) on the memory, along with allowing voltage control all the way up to 1300 (mV I'm assuming). The default voltage is 1165, while minimum is 1163, can anyone verify those numbers?

OC.jpg

Also, neglected to mention, I'm using a Chieftec 700W quality power supply. smile.gif
Edited by dejanribic - 1/3/11 at 8:07am
post #5 of 13
I got the same card, whats the need to overclock it past 900/1300??

You do realize the average increase in FPS from 900 to 1ghz is around 3-4 frames. It's just not worth the OC.
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post #6 of 13
Thread Starter 
Quote:
Originally Posted by narmour;11873581 
I got the same card, whats the need to overclock it past 900/1300??

You do realize the average increase in FPS from 900 to 1ghz is around 3-4 frames. It's just not worth the OC.

I'm not planning on overclocking it past those numbers. I just wanna get to 900/1300 if I can. smile.gif

Is yours running 24/7 like that or just for benching?

I just got the card so I'm trying to get the hang of things? What's your voltage at? And what kinda cooling solution do you use?
Edited by dejanribic - 1/3/11 at 8:06am
post #7 of 13
Mine is running 24/7 at 875/1250.
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post #8 of 13
Thread Starter 
Quote:
Originally Posted by narmour;11879972 
Mine is running 24/7 at 875/1250.

Voltage?
post #9 of 13
I didn't have to alter any voltage, I changed the clocks in CCC.

GPUZ says my current voltage at 1.1v
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post #10 of 13
1300 is roughly the limit on ram-speed for 5870 cards unless you get a really great cooling system for the RAM. If you get grey-screen crashes, your RAM is probably clocked too high. My 5870 was better at 1250 for this reason.

GPU clocks all depend on what you can do before you run out of voltage. The card isn't a reference design, so voltage is not tweakable. I wouldn't count on getting more than 900 on the core.
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