290/290x in xFire underclocked Performance?

[Attic]

Could anyone who has a 290 or 290x xfire or better setup try a significant underclock and post some feedback? Maybe also what volts are working. I've had some system instability undervolting single 290x Tri-x OC via MSI AB more than -20mv with a large underclock (850/1000). I don't have the CPU setup in the current rig to make underclocked xfire numbers worthwhile.

For underclocked values i'm thinking ~800-900 on core and 1000-1250 on memory. I think the power usage % will drop a lot more than performance does going from stock to underclock and i'm mainly interested in resulting heat and performance.

It'd be a 290/x xfire paired with 2500k@4.4 and I think for my setup i'd neeed 800c/1000m to make it work for the area the system will go. Wondering if those speeds will provide 170%+ of single 290/x performance or more.

I'm interested mainly because i'm considering a sizeable swap out of my gaming system into dual 290/x, but i'd need to keep watts way down.

 

[Attic]

bump, not finding much on this.

Considering CPU upgrade and 290x xfire (800/1000-900/1250).

Should let me 1080p 60fps mins with SSAA 2x-4x on most my game library.

 

[f1sherman]

I use

1. -100mV / GPU:500 MHz / MEM:625 MHz (an absolute mV/MHz minimum in AB, 2D games, flash)
2. -100mV / 750 / 900
3. -81mV / 920 / 1100 (my usual setup)
4. -53mV / 947 / 1250 (mining days)
5. +50mV / 1150 / 1500 -||-

(Reference XFX R9 290)

basically it's my memory that necessitates certain voltage; gpu is pretty much stable with respect voltage, so if I hit instability, I have to raise mV or lower MEM.

when hitting stability limits system can be stable during constant load, but BSOD during P state switches. in that case either pull back a little to be completely stable or keep in mind what kind of workloads your system can endure (for example stay away from state switches)

 

[SlickR12345]

You shouldn't have bought 290x Tri-x if you wanted to underclock a card and have it run slower.

That card is running on higher wattage over the stock one and has factory OC over the stock card, so you are not going to be able to significantly lower the clock or wattage, that's just the way it is.

 

[IEC]

You shouldn't have bought 290x Tri-x if you wanted to underclock a card and have it run slower.

That card is running on higher wattage over the stock one and has factory OC over the stock card, so you are not going to be able to significantly lower the clock or wattage, that's just the way it is.

Disagree. I have two 290 Tri-X which are underclocked to 940/1250 with a -60 and -70mV underclock respectively.

 

[Attic]

I use

1. -100mV / GPU:500 MHz / MEM:625 MHz (an absolute mV/MHz minimum in AB, 2D games, flash)
2. -100mV / 750 / 900
3. -81mV / 920 / 1100 (my usual setup)
4. -53mV / 947 / 1250 (mining days)
5. +50mV / 1150 / 1500 -||-

(Reference XFX R9 290)

basically it's my memory that necessitates certain voltage; gpu is pretty much stable with respect voltage, so if I hit instability, I have to raise mV or lower MEM.

when hitting stability limits system can be stable during constant load, but BSOD during P state switches. in that case either pull back a little to be completely stable or keep in mind what kind of workloads your system can endure (for example stay away from state switches)

Ok nice. That makes sense, particularly with mem speeds relation to volts (i've seen similar IME, didn't make sense till reading this) and p state switches.

Basically i'd undervolt and memory would artifact on screen and/or shortly after crash at anything over -30mv on the 290x hynix mem despite massive gpu underclocks. I'll have to revist that and confirm what's happening at 1000-1100 mem and rerun some benchies.

You shouldn't have bought 290x Tri-x if you wanted to underclock a card and have it run slower.

That card is running on higher wattage over the stock one and has factory OC over the stock card, so you are not going to be able to significantly lower the clock or wattage, that's just the way it is.

I'm looking for options, the single 290x Tri-x OC is great at stock settings (1040/1300) for my setup but if want significantly faster i'm going to need to undervolt/underclock for crossfire with new CPU. I'm thinking/hoping there will be a sweetspot for xfire on dual 290x where I can drop power use and clock rates by x% but only lose a fraction of x% for resulting performance.

I'll need to figure out my max stable single card O/C as well which I haven't worked on yet either, should be good for 10%, but it will cost more than that % in power I expect.

http://www.tweaktown.com/tweakipedia/37/sapphire-radeon-r9-290x-tri-x-overclocked-power-consumption-numbers/index.html
The power draw here at maximum overclock is staggering compared to stock.

 

[wand3r3r]

While playing BF4 and watching the core throttle from 1000-850 range on one card and 1000-950 on the other, I am using ~570w fairly constant.

Afterburner is only showing me the voltage on one card atm (needs a reinstall) and it's generally around 1v, although it does show the min/max as 0.92 and 1.15v. I haven't touched the stock settings since my FPS are through the roof as is.

 

[Skurge]

What would you like me to run?

 

[Attic]

While playing BF4 and watching the core throttle from 1000-850 range on one card and 1000-950 on the other, I am using ~570w fairly constant.

Afterburner is only showing me the voltage on one card atm (needs a reinstall) and it's generally around 1v, although it does show the min/max as 0.92 and 1.15v. I haven't touched the stock settings since my FPS are through the roof as is.

Those watts good/great for xfire 290x on 4770k and I'd think with vsync on it should drop a decent amount from that.

What would you like me to run?

I'd like to get at least a -50mv undervolt at 800c/1000m on 290x xfire and am wondering how that would perform in xfire vs stock clocks for your 24/7 setup.

If you could run at 850/1000 I think that is going to be fairly comprable to 290x at 800/1000.

A firstrike graphics score at 1080p is something that I can ground from.

An undervolt is not essential for the test, but helpful.

If you could run a couple of benches there at 850/1000 290 xfire of anything you are setup for and share your thoughts on how it effects performance, temps or possibly power draw.

Overall i'm interested in these areas of performance for an xfire 290x build.
800c/1000m
850c/1100m
900c/1250m
vs
stock


I'd need a large drop in temps for undervolt/underclock vs stock to have a chance of getting two of these going within the confines of space and heat dissapation for where the HTPC case is going. I'll get some of the power/temp savings from running vsync'd to 60fps and also from any undervolt I can manage.


Thanks

 

[wand3r3r]

Those watts good/great for xfire 290x on 4770k and I'd think with vsync on it should drop a decent amount from that.



I'd like to get at least a -50mv undervolt at 800c/1000m on 290x xfire and am wondering how that would perform in xfire vs stock clocks for your 24/7 setup.

VSync would drop it since I'm getting 1xx FPS (the last I checked) so it's a bit overkill. I need to try it again but I found the lag noticeable when I tried before.

I haven't touched my voltage gaming but I used to be able to do 900c with -40mV on one card while mining, but the other card I left at stock and I didn't try undervolting much since it was finicky.