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HIS 3GB 7950 (R9 280), $130, no rebate!

Nice deal!

I've been looking at finally upgrading my ancient Radeon HD5670, but sadly my Dell system has a wimpy PSU so I think I'm limited to a GTX 750ti unless I replace the PSU (which would void the warranty on the relatively new computer).
 
Well, I got one of them installed, in my G3258 @ 3.8 rig.

Pretty decent.

Einstein@home WUs in like 27 minutes, although some take an hour, and MW@Home WUs in 37s.

My CPU is only a dual-core.

With two CPU tasks (WCG), and a MW@H GPU task, the GPU task might complete in 47s instead of 37s, but the GPU load would always be really high when the GPU was working.

With Einstein@Home GPU tasks, I have to reduce my CPU crunching down to 50% (one CPU), in order to leave a CPU core free to drive the GPU task, otherwise I get really pathetic GPU utilization. But that really cramps my CPU tasks.

I kind of wish I has a 3.8Ghz Haswell i3 CPU. I would set the CPU usage to 50-75%, leaving one or two virtual cores free, to drive the GPU tasks and run my web browser and stuff.

I used my 7790 on an IB i3 3.4Ghz, and that's what I did, and it worked out well.

Only problem now is my battery back-ups, they are 550VA / 330W, and I'm not sure if the current rig exceeds their capacity when crunching.

Edit: Installed CyberPower PowerPanel software. My UPS reports that I'm using 191W, when crunching with 50% CPU allocation on CPU tasks, and 76% GPU load on an Einstein@Home task.

That's better (less watts) than what it was reporting for my Q9300 @ 3.0 quad-core, with a HD4850 card, and about the same as it reported for same rig, with a GT630 Kepler 384SP card crunching.
 
Last edited:
VirtualLarry said:
With Einstein@Home GPU tasks, I have to reduce my CPU crunching down to 50% (one CPU), in order to leave a CPU core free to drive the GPU task, otherwise I get really pathetic GPU utilization. But that really cramps my CPU tasks.
Click to expand...
What is the GPU utilization when running one task?
You might be able to run two Einstein GPU tasks on one CPU, as each task only uses 2-4%. (My GTX 560 Ti does.)
 
GLeeM said:
What is the GPU utilization when running one task?
You might be able to run two Einstein GPU tasks on one CPU, as each task only uses 2-4%. (My GTX 560 Ti does.)
Click to expand...

If your Einstein@Home tasks are only taking 2-4% GPU load, then you aren't reserving a CPU core to drive the GPU. They should be 75%+ GPU utilization. At least, they are on my 7950, which is arguably a faster card than a 560ti, I think.

I have to set my "multiprocessor percentage" setting such that BOINC won't use one of my CPU cores, and then Einstein@Home will use it.
 
VirtualLarry said:
If your Einstein@Home tasks are only taking 2-4% GPU load
Click to expand...
Hmmm ...

Let's try this:
You might be able to run two Einstein GPU tasks on one CPU, as each GPU task only uses 2-4% of one CPU.

So by running two GPU tasks your GPU usage would be closer to 100% instead of only 75%. And your CPU usage would be twice "2-4%" or a total of 4-8% CPU usage.

On my GTX 560 Ti, two GPU tasks reach 90% GPU usage with 1 of 8 cores set aside.
 
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