Since I wrote the first post on mining with a Phi 7220 setup I’ve literally been drowned in questions and inquiries, in particular relating to “what performance would I get on this or that other flavor of the phi”. For a while now, I’ve always replied to those as “I have ordered a 7250 system, and will update as soon as I get it”….
Now earlier yesterday, my first order from Exxact (a 2U system with 4 nodes, each having a phi 7250, 48GB of memory, a 150GB harddrive, and OPA cards) has finally arrived. I’m still in the very first stages of getting it up and running (I do have a day job, so more work – and a full blog post – has to wait until the weekend), but I at least installed a CentOS last night, ran a first test, and can therefore at least share the “first light” results: right out of the box (literally…), I’m currently getting 2350H/s per node (which’d be roughly 9.5kH total – I only installed one so far).
Now 2350H/s is not bad at all for a single node (in particular at that price), but the observant reader will immediately see that it is indeed somewhat less than expected: from pure clock rate and core count I’d have expected close on 3kH per node, so at 2350 it’s performing about 20% lower than expected. At least for now, I do not yet know why the 7250 actually performs 5-10% lower than a 7210/7220 would (it has both more core and higher clock rate!), and in fact, I’m still rather optimistic that it’s just something I haven’t properly configured, yet (most obvious difference is a very different kernel version than what my 7210 and 7220s use?!)…. so most likely, it’ll eventually do even better than that.
Anyway, I had promised to share even the earliest results, so wanted to drop this short note now rather than wait for the final performance after tuning. And I promise, I’ll write a full blog on how to properly set up and configure those 7250 nodes as soon as I figure out what’s wrong with the default set-up.
- Downside: Using version 0.9.0, the phi 7250 performance (at least for now) is about 20% lower than expected
- Upside: I can confirm at least 2350H/s/node (which will already pay for the node in less than 12months!)… and it can only get better 🙂