1. Greener modelling on greener computers Dr. Julian Dean Sheffield centre of magnetic materials and devices Working with very PC Professors T. Schrefl J. Harding Dr’s C.L. Freeman A. Goncharov G. Hrkac Phd students S. Bance M.A. Bashir N. M. Saiden

2. What we do Micro magnetic modelling of magnetic materials Magnetic simulations (nano wires, hard drives, magnetic materials) Atomistic and quantum mechanic simulations Structural analysis for sensors We require lots of processors and memory constantly running

3. What we have now Departmental computer cluster (18 nodes, dual processor, dual core with 16 Gb memory each) – 72 processors Clustervision 1 cluster of 10 various different PC’s running Linux, mainly Viglen - 40 processors 1 PC per student and staff ~ 11 Pc’s Housed in a cooled room for 2 cluster racks of 20 nodes Plus -

4. Upgrades – why are we concerned Typical Computer HP DL360G5 Greener alternative (provided by Very-pc) VeryPC Janus II On 0% Load (per node) On 100% Load (per node) 162 W81 W 287 W143.5 W A simple comparison for power and price: Cost 2 servers ~ £1500 (each) (2 x quad core) – 8 processors 1 servers ~ £3800 (each) (2 x quad core) - 8 processors

5. Upgrades - why Typical Computer 2 x HP DL360G5 Greener alternative (Very-PC) VeryPC Janus II CO2 Saved over 3 years per unit: Approx 9 Tons ~1.25 Range Rover Sports or 215 average Trees. If we assume we run at average 80% utilization, with a PUE of 2 (conservative A/C consumption estimate), 24/365 3 year projection (@ £0.14/kwh) £4459 £1927 Saving ~ £600 per year

6. Upgrades – reasons Reduces the cooling required – saves university space Makes us feel better – Raises university profile More support and advertisement of such systems Incentive for going green –> it would cost ~20% more in some cases to go green, but we are saving universities money. A subsidised policy would be beneficial for both sides. What we would like

7. Contacts SCAMMD Very PC www.very-pc.co.uk j.dean@shef.ac.uk Thank you for you time