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suggesting a pc.
https://www.wsgf.org/phpBB3/viewtopic.php?f=72&t=23568		 Page 1 of 1
Author:  thedeadguy [ 31 Jan 2012, 18:39 ]
Post subject:  suggesting a pc.
um i was thinking of upgrading to a new ivy bridge based computer, and the newest addition to nvidia kepler 110 chip. but the question is i been thinking of building with a 120gb patriot wildfire ssd ( already bought) and then having an additional storage device. that happens to be a sas driver by hp that is 600gigs and well has a 15k rpm speed. i am doing the 15k as i am simple sick of waiting for games such as skyrim and others to stop having cranky time 2 minute loads or less, which to me is a bit shite if you ask me. the price of a sas drive is over the top, but i was hoping to get a bit more peformance as a 600gb ssd is well two thousand dollars.
thanks matt.
Author:  Gilly [ 01 Feb 2012, 11:15 ]
Post subject:  SAS support on desktop
SAS support on desktop hardware is limited, so expect to factor in a card for that too, adding to the cost.

If you really need 600GB of storage, that is faster than your average drives, drop the cash on a 600GB Velociraptor drive IMO. The other is a waste of cash.

Good luck with the other elements of your build, make sure you do not skimp on a PSU, you want at least an AX850 PSU, if you are even going to think about 2 cards, I would look at something nearer 1000W mark. Since I have been buying beefier PSU's than I need, I seem to have far less problems than before (has a shitty generic one that was faulty, a Thermaltake that decided to stop working just out of warranty, then an OCZ powerstream that let go in spectacular fashion). Since I got my 510W PC P&C back in the day, and then this AX850, not had a minutes bother. And I did have a bit of a beast of a rig back in the day, PSU never broke a sweat,
Author:  thedeadguy [ 01 Feb 2012, 22:55 ]
Post subject:  at the moment i have a
at the moment i have a thermal take toughpower 750 watt psu that i got back in 07 and it still hasn't died on me. i at the moment have my eyes on the thermaltake toughpower grand 1050 watt psu. it's 80plus gold, and has some very good features for the price. so a 5k difference is a waste of money, based on the performance. i find it kind of shame that steam a very high tech company would try to get load times running less as their running servers. what are the main benefits of having a sas besides fast reads and writes?
Author:  Gilly [ 02 Feb 2012, 17:42 ]
Post subject:  SAS is actually really good,
SAS is actually really good, and there will be a difference, but not very much. IMO 7200 > 10000 jump is probably larger than 10000 > 15000, because you also jump to 2.5" disks, which means that you are working with a lot lower stroke length, which also helps.

I was just meaning, with the high cost of the drive plus the card to drive it, the extra cost wouldn't be worth it. I think you can just get a SAS to SATA backplate, but that will cost, although not a lot.

From the wiki article

http://en.wikipedia.org/wiki/Serial_attached_SCSI

Serial Attached SCSI (SAS) is a computer bus used to move data to and from computer storage devices such as hard drives and tape drives. SAS depends on a point-to-point serial protocol that replaces the parallel SCSI bus technology that first appeared in the mid 1980s in data centers and workstations, and it uses the standard SCSI command set. SAS offers backwards-compatibility with second-generation SATA drives. SATA 3 Gbit/s drives may be connected to SAS backplanes, but SAS drives may not be connected to SATA backplanes.


Comparison with SATA

Systems identify SATA devices by their port number connected to the host bus adapter, while SAS devices are uniquely identified by their World Wide Name (WWN).
SAS protocol supports multiple initiators in a SAS domain, while SATA has no analogous provision.
Most SAS drives provide tagged command queuing, while most newer SATA drives provide native command queuing, each of which has its pros and cons.
SATA uses the ATA command set; SAS uses the SCSI command set. ATA directly supports only direct-access storage. However SCSI commands may be tunneled through ATA for devices such as CD/DVD drives.
SAS hardware allows multipath I/O to devices while SATA (prior to SATA 3Gb/s) does not. Per specification, SATA 3Gb/s makes use of port multipliers to achieve port expansion. Some port multiplier manufacturers have implemented multipath I/O using port multiplier hardware.
SATA is marketed as a general-purpose successor to parallel ATA and has become common in the consumer market, whereas the more-expensive SAS targets critical server applications.
SAS error-recovery and error-reporting use SCSI commands which have more functionality than the ATA SMART commands used by SATA drives.
SAS uses higher signaling voltages (800–1600 mV TX, 275–1600 mV RX) than SATA (400–600 mV TX, 325–600 mV RX). The higher voltage offers (among other features) the ability to use SAS in server backplanes.
Because of its higher signaling voltages, SAS can use cables up to 10 m (33 ft) long, SATA has a cable-length limit of 1 m (3 ft) or 2 m (6.6 ft) for eSATA.


Hope to help a bit!
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