Benchmark - Why are results so different?

[RandomQuestion]

Why are benchmarks not all the same?

I can understand that there can be some variances (eg. different apps installed/running, OS, etc).

But how can the same machine undergo a benchmark test within minutes and get different results every time.

Example:
MacBook Air 2013 i7 8GB = Geekbench 6594 32bit
http://www.tonymacx86.com/attachments/macbook-air/58619d1370976073-2013-haswell-macbook-air-geekbench-results-screen-shot-2013-06-11-2.38.43-pm.png

MacBook Air 2013 i7 (assumed 8GB because of score) = Geekbench 7489 32bit
http://photos.macnn.com/news/1306/mba-geek-lg.jpg


What's odd is that an iOS device's results are almost always consistent!!

 

[catalyst07]

Why are benchmarks not all the same?

I can understand that there can be some variances (eg. different apps installed/running, OS, etc).

But how can the same machine undergo a benchmark test within minutes and get different results every time.

Example:
MacBook Air 2013 i7 8GB = Geekbench 6594 32bit
http://www.tonymacx86.com/attachments/macbook-air/58619d1370976073-2013-haswell-macbook-air-geekbench-results-screen-shot-2013-06-11-2.38.43-pm.png

MacBook Air 2013 i7 (assumed 8GB because of score) = Geekbench 7489 32bit
http://photos.macnn.com/news/1306/mba-geek-lg.jpg


What's odd is that an iOS device's results are almost always consistent!!

If I recall, Geekbench wholly benchmarks your computer. The 256GB ssd is almost 2x faster than the 128GB drive. This could account for the large difference...

 

[RandomQuestion]

I thought the new PCI-E SSD's were all the same speed regardless of their capacity.

 

[Weaselboy]

I thought the new PCI-E SSD's were all the same speed regardless of their capacity.

Nope... the new 128GB version is quite a bit slower in write speeds. Read speeds are about the same though.

If you search the forums you can see some speed test from 2013 owners confirming this.

 

[johnjey]

If I recall, Geekbench wholly benchmarks your computer. The 256GB ssd is almost 2x faster than the 128GB drive. This could account for the large difference...

The benchmark by geekbench 2.0 seems more a joke as mine is i5/8GB/512SSD and have never gone beyond 6858 in its score...so i wouldn't sweat on it