Timings

alan_sh · Posted: Fri Jul 09, 2010 1:58 pm Post subject: Timings

Now that I have to use an SDHC card for the full WE maps, I thought I'd do some quick timings to see whether the card was faster than internal memory.

So, on internal memory, I loaded Europe West. On an SD card, I loaded the full WE maps. I had two cards - one was an 8gb SDHC class 4 device, the other was a 4gb SD card (very rare).

Put the SD card in, switched on the device (TT Go 730) and selected the full maps. Did a route from my house (Rochdale) to Cambridge. It took about 80 seconds.

Cancelled the route. Switched off the device. Put the SDHC card in - did the same route. Took about 75 seconds.

Cancelled the route. Removed all cards and switched it back on. Did the same route again. It took just over 30 seconds.

So, this proves to me that the internal memory is much faster than and SDHC card and that is what you should be using if at all possible.

Hope this helps

Alan

MrT · Posted: Fri Jul 09, 2010 3:06 pm Post subject:

Do you think that having the partial map on the internal memory may be causing this? I wonder as on much older versions of TT (on a PDA) I used to have over time a regional map, UK map, UK & Major Roads of Europe and Western Europe and the smaller maps always performed much quicker that the larger.
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alan_sh · Posted: Fri Jul 09, 2010 3:14 pm Post subject:

It's not that much smaller.

Alan

matthewj · Frequent Visitor Joined: Apr 03, 2006 Posts: 751

You need to consider the "class" of SD card you have when looking into this. Apparently the higher the class number, the faster the memory access is, but also the more expensive it is. Some cameras require class 6 for example to be able to record video, as lower classes cannot sustain the writing speed.

MrT · Posted: Fri Jul 09, 2010 4:07 pm Post subject:

It is also a case of how fast the TT can read and write, it would be pointless buying a class 6 card if the TT could only write at class 4 speeds. Has anyone any idea of the TT's capabilities here?
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Drivelux

mpwilson99 · Posted: Fri Jul 09, 2010 5:05 pm Post subject:

35 seconds on the PDA with class 2 16gb SHDC.
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Border_Collie · Posted: Fri Jul 09, 2010 5:49 pm Post subject:

Obviously the software also makes a difference.

Mio P350 - iGO 8.0 - Full Teleatlas E and W Europe mapping - 2GB SD Card x150 (approx 19x speed) - Fastest Route Rochdale to Cambridge - 8 seconds.
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AliOnHols · Pocket GPS Verifier Joined: Oct 15, 2008 Posts: 1936

Although I've never thought to do the test I as you have I must say that the results surprise me. The only difference between Internal Memory and SDHC card I have noticed is when I am transferring data between the PC and SatNav or the memory card in a reader. The transfer rate to SatNav is in kB and to the Memory card is in MB.

Is there any chance that the TT has a cache memory and that it has remembered the route from the previous two calculations and has just pulled the route from it's memory?
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alan_sh · Posted: Sat Jul 10, 2010 7:39 pm Post subject:

I don't think so - but I can repeat it next time I'm playing.

andy-c1 · Posted: Sat Jul 10, 2010 10:22 pm Post subject:

I can agree with that as I thought putting maps on a sd card would make things faster , a few before the map update I put the maps back onto teh internal drive and there was a remarkable difference in speed
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Robin2 · Posted: Sat Jul 10, 2010 11:21 pm Post subject:

I have a 720 with the full Western Europe map and Navcore 8.351 on a 4GB SDHC card (not a Class 6) and the Western zone map and Navcore 8.351 on the internal memory. With the card in, it calculates Rochdale to Cambridge in 45 seconds. Removing the card and using the smaller map and application on the internal memory, it takes just over 35 seconds.
In real life I can't see any difference between them
Robin
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M8TJT · Posted: Sat Jul 10, 2010 11:41 pm Post subject:

Border_Collie · Posted: Sun Jul 11, 2010 1:10 pm Post subject:

John o' Groats - Land's End = 17 seconds. Yep, same here.

M8TJT · Posted: Sun Jul 11, 2010 5:07 pm Post subject:

Andy_P · Posted: Sun Jul 11, 2010 10:32 pm Post subject:

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