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Order it with the fusion drive or 256 SSD upgrade and you will see a huge difference. If you do CPU/Video tasks you will also see a large difference there.
 
You will see a big difference no matter what hard drive you choose. What is the exact spec of your iMac? Is pretty much comparing a first generation I series processor to a fourth gen. Plus I'm guessing the iMac you are looking into have more ram as well. Plus a considerably better graphics card. A good question would also be what do you do on the machine? If you are just web browsing and checking emails, then there will be hardly an noticeable difference and if you wanted a performance increase with that, then you could just buy an ssd. If you do more heavy work, then it a definite upgrade no matter the drive.
 
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You will see a big difference no matter what hard drive you choose. What is the exact spec of your iMac? Is pretty much comparing a first generation I series processor to a fourth gen. Plus I'm guessing the iMac you are looking into have more ram as well. Plus a considerably better graphics card. A good question would also be what do you do on the machine? If you are just web browsing and checking emails, then there will be hardly an noticeable difference and if you wanted a performance increase with that, then you could just buy an ssd. If you do more heavy work, then it a definite upgrade no matter the drive.

Hi all I do is basic stuff nothing major.
I just thought that mine is way over due for a upgrade.
 
Hi all I do is basic stuff nothing major.
I just thought that mine is way over due for a upgrade.

When you say that, are you saying it because it feels slow and no longer fits your needs? If not then there is no need to upgrade, because if the machine is fast enough for you right now, I doubt you seeing any major differences with a new gen iMac. I would recommend however going to your nearest Apple store and just having a shot of one, as I feel that the screen will be a much greater upgrade for you over performance. Then you just have to decide if that is worth the money to upgrade for what you are gaining.

Hope this helps :)
 
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