No problem.
A Sata SSD is still much, much faster than a HDD. Sata III has 6GBps bandwidth.
Most people that have SSDs have Sata SSDs. Along with RAM (if you need more), it's the best and easiest upgrade you can make, that will make a real difference. A HDD is a major bottleneck for a computer. All that lag and waiting is generally caused by having to wait for the disk to fetch the data you need. It's horribly antiquated.
Yes if you get something like a 3rd Gen PCIe nvme SSD you can get 3 to 4 times the performance of a Sata SSD in benchmarks, because the interface bottleneck is removed, but for general use you won't really notice that in real world use.
If you haven't got an SSD yet by the way, you may want to wait for black friday/cyber monday.
Amazon will likely have some very good deals.
I'd recommend one of the latest Samsung drives, like the 850 EVO.
This is a great price:
http://www.amazon.co.uk/Samsung-2-5-Inch-Solid-State-Drive/dp/B00P736UEU
The 1TB performs even better, and you don't pay any premium for the extra storage - it's basically twice the price of the 500GB.
I run a 1TB 850 Pro and Windows 10 boots in about a second.
I'm assuming you have a Sata III interface, so do make sure your computer is compatible etc.