Turn a 7870 xt to a 7950

[brownninja97]

My current stuff is a core clock of 1000mhz

memory clock 1250

 

How much higher would i have to go before i can match a 7950.

[brownninja97]

Btw the card is voltage locked, i can oc higher but not in my current case as it reached 83oc so overclocking would be a bad idea. Once i get a intake fan it will help cooling a lot as my current case has a exhaust and thats it.

[WoodenMarker]

It should already beat a stock 7950 which is at 800mhz. 

Of course, a 7950 should never be left at stock.

[brownninja97]

It should already beat a stock 7950 which is at 800mhz. 

Of course, a 7950 should never be left at stock.

Underclock of coarse, imma right, imma right? ok sorry.

[Jumper118]

if you got a aftermarket air cooler then you should be able to clock it until you reach the stable limit at the locked voltage. my mates sapphire 7870 got to 1150mhz before we had to put the voltage up but that was still running under 70c at 1150mhz, i think we got it to 1275mhz when we increased the voltage.

[xAcid9]

Well, post some benchmark of your overclocked 7870xt so we can compare. :P

[brownninja97]

Well, post some benchmark of your overclocked 7870xt so we can compare. :P

Not a good idea as my i3 bottlenecks it to hell.

[brownninja97]

if you got a aftermarket air cooler then you should be able to clock it until you reach the stable limit at the locked voltage. my mates sapphire 7870 got to 1150mhz before we had to put the voltage up but that was still running under 70c at 1150mhz, i think we got it to 1275mhz when we increased the voltage.

Ive got the xfx double d cooler. It was cheaper the sapphire one which was why i got it and weirdly it was cheaper then the reference design version as well.

[xAcid9]

3DMark GPU score doesn't affect by CPU performance that much or even at all.  ;)

[TechFan@ic]

According to Tom's Hardware about 1150mhz, although I believe you'd need slightly less, probably around 1100mhz.

 

 

CrossFire

PowerColor's HD7870 PCS+ Myst Edition shows its Tahiti roots when it comes to CrossFire configurations; you cannot pair it up to a normal Radeon HD 7870. Matching it up to any Radeon HD 7900-series card isn't a problem, though. In fact, we installed our review sample next to a HIS 7950 X², and we matched the performance level of the two cards by overclocking the PowerColor HD7870 PCS+ Myst Edition to 1.15 GHz. This gets us close to the same single-frame rendering times. However, if you leave both cards at their factory-set frequencies, you'll see a lot of micro-stuttering. Even RadeonPro couldn’t alleviate the issue, leaving us with dropped frames.

 

 

http://www.tomshardware.com/reviews/tahiti-le-7870-7930-benchmark,3401-5.html

[brownninja97]

Well, post some benchmark of your overclocked 7870xt so we can compare. :P

I just did 3dmark11. vantage crashes and i dunno why. Graphics score 7820 Physics score: 3454 Combined score: 3317

[brownninja97]

I just did 3dmark11. vantage crashes and i dunno why. Graphics score 7820 Physics score: 3454 Combined score: 3317

After pushing the core clock up to 1150mhz i got 7987. Imma try and go even further. 3ghz HELL YEAH.

[xAcid9]

Did you increase the power limit?

[xAcid9]

I tried to match your processor by disabling HyperThreading, TurboBoost and 2 cores. I get slightly better physic score probably because of Ivy Bridge better IPC.

 

800mhz / 1250mhz = P6022

 

850mhz / 1250mhz = P6250

 

950mhz / 1250mhz = P6546

 

Using AMD Catalyst 13.x (13.150.1.0 June 21) driver.

 

 

Btw, 7870 XT/LE usually score around 8k-9k when clocked at 1150mhz.  :ph34r:

[brownninja97]

Did you increase the power limit?

Nope its at 0%. I tried to push the memory up but that lowers the score. 12.104.0.0 Thats the driver version im using maybe i should upgrade. Are there any programs i can use which auto update it.

[brownninja97]

I tried to match your processor by disabling HyperThreading, TurboBoost and 2 cores. I get slightly better physic score probably because of Ivy Bridge better IPC.

 

800mhz / 1250mhz = P6022

 

 

850mhz / 1250mhz = P6250

 

 

950mhz / 1250mhz = P6546

 

 

Using AMD Catalyst 13.x (13.150.1.0 June 21) driver.

 

 

Btw, 7870 XT/LE usually score around 8k-9k when clocked at 1150mhz.  :ph34r:

Some of this could be due to the other shitty dell parts at the ram is clocked to 667mhz even being ddr3. also its a H61 board which is horrible and its a dell. Also i think the i3 may play a part in some of these issues.

[xAcid9]

Nope its at 0%. I tried to push the memory up but that lowers the score. 12.104.0.0 Thats the driver version im using maybe i should upgrade. Are there any programs i can use which auto update it.

 

Increase the power limit to +15/+19/+20, else your overclocking will be useless and you'll get less performance.  :lol: 

Monitor your VRM temperature with GPUZ.

[xAcid9]

Some of this could be due to the other shitty dell parts at the ram is clocked to 667mhz even being ddr3. also its a H61 board which is horrible and its a dell. Also i think the i3 may play a part in some of these issues.

 

DDR3-1333 bus clock is 666mhz man.. that is normal.

[brownninja97]

Increase the power limit to +15/+19/+20, else your overclocking will be useless and you'll get less performance.  :lol: 

Monitor your VRM temperature with GPUZ.

I use gpu meter addgadgets. I find them to be better as it starts with startup instead of having to open manually. Thanks for the advice.

[brownninja97]

Did you increase the power limit?

I just added the new driver and msi afterburner is showing nothing now, no power, no core, no memory. Thats not bad right?

[OneGun]

Why not see if you an flash the bios to unlock the Voltage?

[brownninja97]

Why not see if you an flash the bios to unlock the Voltage?

Its a nono with XFx we all know that.

[brownninja97]

Ok final is 8887 which isnt too make i think. I pushed the core clock to 1175 and the power target to 20% above the normal setting.

[OneGun]

Its a nono with XFx we all know that.

I didn't know it was a XFX..

[xAcid9]

Downclocked my proc to 3.0ghz and run the benchmark while overclocking my gpu to 975mhz with +20% power limit. HD7950 with Boost clock speed is only 925mhz.

 

 

 

I think clock per clock, 7870XT is on the same level as GTX 760.