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Question about SSDs


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#1 xXAlphaXx

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Posted 11 May 2012 - 04:51 AM

So I am deciding to make a push into SSDs and I have just been noticing the read write speeds are documented as such on newegg:


Sustained Sequential Read: Up to 500 MB/s (SATA 6Gb/s)
Sustained Sequential Write: Up to 175 MB/s (SATA 6Gb/s)

Does the SATA6Gb/s mean that it can only function at full speed on a SATA 6Gb/s port?


EDIT

So after more research it looks like I am seeing that a SATA III drive functions just fine on a SATA II port but it will be throttled to keep the drive operating within the ports capabilities... which is a head scratcher if your runnning a single drive on that one port. Even if it was reading and writing simultaneously, it would be running around 675MBs out of 3GBs so... theoretically wouldn't it not really matter which ports you have since you can only run a single drive on each SATA port?

Edited by xXAlphaXx, 11 May 2012 - 05:07 AM.

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#2 kisk

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Posted 11 May 2012 - 09:01 AM

Real-world speeds will be much less, but check out this review. As you will see, you can get better speeds with a 6GB/s drive but you'll have no problem with 3gb/s:

http://www.tomshardware.com/reviews/sata-6gbps-performance-sata-3gbps,3110.html

Edited by kisk, 11 May 2012 - 09:04 AM.

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#3 rotor123

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Posted 12 May 2012 - 01:54 PM

I suspect you are confusing Gigabits and Megabytes. 8bits to the byte.

The only thing is I would read user reviews before buying a SSD. SO far it looks like the Intel and the Samsung SSDs are the most reliable.

All my computers run SSD boot drives. The smallest being 120Gb and the largest being 300Gb.

Good Luck
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Edited by rotor123, 12 May 2012 - 01:55 PM.

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#4 alexsmith2709

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Posted 12 May 2012 - 04:21 PM

I believe 3 Gigabits per second is about 384 Megabytes per second, therefore you would need the SATA III port to take full advantage of the drives speed.
I have the Crucial M4 128GB drive and below are my scores from AS SSD Benchmark so you can see my real world scores for this drive (with this browser window open at the same time).
The quoted speeds on the crucial website are:
Sustained Sequential Read: Up to 500 MB/s(SATA 6Gb/s)
Sustained Sequential Write: Up to 175 MB/s(SATA 6Gb/s)
4KB Random Read: Up to 45,000 IOPS
4KB Random Write: Up to 35,000 IOPS

Here are my speeds:

AS SSD Benchmark 1.6.4237.30508
------------------------------
Name: M4-CT128M4SSD2
Firmware: 000F
Controller: iaStor
Offset: 1024 K - OK
Size: 119.24 GB
Date: 12/05/2012 22:20:32
------------------------------
Sequential:
------------------------------
Read: 496.47 MB/s
Write: 198.66 MB/s
------------------------------
4K:
------------------------------
Read: 21.44 MB/s
Write: 66.06 MB/s
------------------------------
4K-64Threads:
------------------------------
Read: 200.25 MB/s
Write: 60.50 MB/s
------------------------------
Access Times:
------------------------------
Read: 0.175 ms
Write: 0.384 ms
------------------------------
Score:
------------------------------
Read: 271
Write: 146
Total: 549
------------------------------

#5 xXAlphaXx

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Posted 13 May 2012 - 12:01 AM

bits, bytes... of course. Same way they get you on the internet speeds....

Better question... why do they measure stuff in bits any more when byte is the standard nowadays. :|

Anyways then it makes more sense when the speeds get divided by 8.

alexsmith, that is the exact drive I ordered is the Crucial M4, is yours connected to a SATA III?
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#6 dpunisher

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Posted 13 May 2012 - 01:31 AM

M4s are rock solid. Make sure you upgrade firmware to the latest and greatest before you format/install. Firmware updates have all gone smooth on mine but no reason to put data at risk if you don't have to.

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#7 alexsmith2709

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Posted 13 May 2012 - 03:26 AM

Yeah, mine is connected to a SATA III port.
If you buy it now it should have the latest firmware (000F) but if not, like dpunisher says, do upgrade before installing windows as a safety measure.

#8 xXAlphaXx

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Posted 13 May 2012 - 10:40 PM

I'm glad to know I've made an awesome choice. My drive will be here tomorrow and I will play around with it a bit.

How do you benchmark your drive like that alex?





How does one update the firmware on a SSD?
EDIT - Google answered this one for me: [Source]

Edited by xXAlphaXx, 13 May 2012 - 10:44 PM.

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#9 coxchris

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Posted 13 May 2012 - 11:34 PM

I would recommend downloading SSD Tweaker to Optimize it fully and note that TIRM is enable and no defragging or etc ect.
http://majorgeeks.com/SSD_Tweaker_d6382.html

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#10 rotor123

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Posted 14 May 2012 - 09:44 AM

Do not forget to set the SATA ports to AHCI before installing Windows.

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#11 alexsmith2709

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Posted 14 May 2012 - 01:34 PM

I use AS SSD Benchmark




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