Lenovo ThinkCentre M91p Ultra-small Desktop PC

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Comparison vs. M90p

System Measurements
System State
USFF ThinkCentre M91p (Core i5-2500S)
USFF ThinkCentre M90p (Core i5-650)
CPU Temp
dBA @0.6m
Power (AC)
CPU Temp
dBA @0.6m
Power (AC)
H.264 Playback
CPU Load
CPU + GPU Load
Ambient: 22°C, 10~11 dBA.
*External temperature measured using an IR thermometer pointed at the hottest portion of the chassis.
We measure SPL at 0.6m for all devices meant to be used atop a desk, as it is more realistic a distance than the usual 1m. It also corresponds to the "seated user SPL" distance specified in the computer noise measurement standard ISO 7779.

Compared to last USFF ThinkCentre sent to us by Lenovo, the M90p featuring the same case, the M91p is an environmentally superior machine. It runs cooler and quieter on load and uses substantially less energy thanks to the i5-2500S. The power consumption numbers are staggering, almost half that of the M90p when idle, and a 20% improvement on load. The CPU also has two more cores, so it's significantly more powerful to boot.

CPU/GPU Performance

The i5-2500S is a rather rare CPU for sale to OEMs only and is not available through retail channels. It's a 65W quad core Sandy Bridge chip with a 2.7 GHz clock speed that can be Turbo Boosted up to 3.7 GHz. Thus in single-threaded applications its performance is comparable to the i5-2500K, while multithreaded performance is closer to that of the i5-2400S (2.5 GHz, 3.3 GHz with Turbo Boost). It is equipped with the same integrated HD 3000 graphics processor as the 2500K. For performance analyses of these chips, please read our reviews listed below:

Hard Drive Performance

HD Tune Read benchmark result.

Though the Seagate 7200.12 line is a bit long in the tooth, the 500GB model had a respectable file transfer rate according to HD Tune. The 18.1 ms access time was very poor though, similar to what you would find on a "green" drive.

Pre-installed Software

Aside from the typical Windows bloatware like Adobe Reader, Bing Bar, Microsoft Silverlight, a trial edition of Office 2010, and a Norton Internet Security installer, the M91p came with Corel Burn.Now, Corel DVD MovieFactory, and a host of Lenovo system management utilities.

HD Tune Read benchmark result.

The ThinkVantage Toolbox is the star of this menagerie, tying everything together into a portal to a variety of system settings, diagnostics and miscellaneous information. What they've done is essentially pulled settings and menus native to Windows and put it all in one easy to find location and dressed it up. While we would like to say it adds something extra for the experienced PC user, it seems more of a tool for the neophyte rather than the IT professional performing maintenance or troubleshooting a problem.

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