SSD is the path to high performance in modern systems, but $100 doesn't buy much of an SSD. You might want to save up for a little while and get a high performance 256GB drive (ideally even larger). It's big enough that you could make it your system drive, and point Photoshop at it for Scratch access as well, and maybe even keep the current work you're doing on it.
Advisories about how to configure systems (e.g., "never set scratch to your system drive") don't really apply with SSD storage, because there is no latency with an SSD.
What kind of SATA connections does your new PC offer? Ideally you have SATAIII (6 gigabit), which would really be able to take advantage of a good SSD.
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While Adobe list system requirement required for applications like Photoshop what the list is the minimum requirements. You system meets these however what Adobe recommends is a compleatle different story. For ther suite they recommend much more. Photoshop is not the application the need the most system. Still is a resource hog and perform better when it can optain lots of you machines resources. Here are a couple of links for you to look at:
my new PC has SATA III (6GB).
If I get another HD from WD (500GB 7200rpm) to use as scratch disk, will it be as useful ? (I an extra old WD HD).