Question about Photoshop scratch disk and specific setup

Hi Folks
Thanks for the help in advance.
I'm a novice and need help finding a solution to a new PC Build. (Windows 7 Pro 64bit with Photoshop CS6)
I only recently found out about having a scratch disk dedicated for photoshop (very novice i know ), and was wondering if a 120-128GB SSD would be enough? (Please bear in mind I can't fit large SSD raid configs to my budget, plus I live in New Zealand, so prices are higher for SSD at the moment).
I only edit single camera RAW files at a time around 25mb per file, with no large amount of layers and very rarely do large images i.e. Panorama etc. I have searched the forums but could not find a concrete answer.
My setup was originally meant for a HTPC (I don't intend to overclock), but I will also be using it for light photography projects. Specs below:
CPU: Intel i7 3770
Mobo: Asrock B75 Pro3-M (or Asus P8H77m Pro, depending on budget)
16gb Ram (maybe bump up to 32gb later)
120-128gb SSD for OS and apps
120-128gb SSD scratch disk
2 TB HDD for storage
If anyone knows, the motherboards I've listed have 3x Sata3 ports, Asrock has one Intel chip and two Asmedia controlled Sata3 ports, while Asus has 2x Intel controlled and 1x Marvell controlled Sata3 port. If I went with the Asrock, would it be okay to connect the OS/Apps SSD to the intel controlled sata3 port and have the scratch disk and storage HDD to the Asmedia sata3 ports?
And one more novice question, when I begin to edit my images, is it best to transfer my photos from memory card to storage HDD then work from there? Or would it be quicker opening images direct from a USB 3.0 card reader / USB 3.0 external hard drive?
Thanks again everyone, really appreciate it

priddye wrote:
Just to clarify, if/when I get one 256gb SSD for my main C: drive, I can load the OS/Apps and store some data for the time being (until I get another SSD) and use the 2TB HDD for scratch disk only?
Yes, that's what I meant. You could try putting Photoshop scratch on C: at least temporarily, and watch your free space carefully. If you don't work on big documents or set your history states to be very large, it might be workable. But be careful. The safe "set it and forget it" configuration is to make your HDD the one and only Photoshop scratch drive.
When I do get around to getting the second 256gb, I will look at installing the two SSD's in RAID configuration. If i were to do this, can I load the OS/Apps to the RAID SSD's as well as using them for scratch disks and have the 2TB HDD for storage? I hope that makes sense.
Sounds about right; with 512GB on tap you should be able to run just about everything from C:, as long as you don't keep your entire photo library on there. Realistically, on a big system that's got a lot of apps installed and has been used for some time, Windows and your apps may end up consuming 100 to 150 GB, so that would still leave you a lot of breathing room.
Keep in mind that what you describe may require 3rd party re-partitioning software and/or backup and restoral, or a complete reinstallation of Windows and everything (usually the latter is what is recommended when moving up to a RAID system volume).
By the way, SSDs stay in best working order if you overprovision - i.e., maintain a fair amount of free space. The internal controllers need the free space to keep the data organized well and maintain top performance.
-Noel

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