Intel has various different i7 processors.
To see which Intel intrinsics are available on the Intel i7 processor that you have, launch Terminal.app and issue the following one-line command:
sysctl -a | grep machdep.cpu.features
You can cut-and-paste that command into the Terminal.app command prompt, and press return.
You'll get (cryptic) a list of which intrinsics are supported on your particular Mac with your particular i7.
That list will look something like this:
machdep.cpu.features: FPU VME DE PSE TSC MSR PAE MCE CX8 APIC SEP
MTRR PGE MCA CMOV PAT PSE36 CLFSH DS ACPI MMX FXSR SSE SSE2 SS HTT
TM PBE SSE3 PCLMULQDQ DTES64 MON DSCPL VMX SMX EST TM2 SSSE3 FMA
CX16 TPR PDCM SSE4.1 SSE4.2 x2APIC MOVBE POPCNT AES PCID XSAVE
OSXSAVE SEGLIM64 TSCTMR AVX1.0 RDRAND F16C
The above is from a Mac with an i5 (not i7), and shows SSSE3 is available on that particular i5.
The local i5 is a quad-core.
> About This Mac will show how many cores you have on that i7. Probably four cores; a quad-core. That same display will show which graphics processing is provided with your i7.
Apple deprecated OpenCL a while back. Here's the version info: Mac computers that use OpenCL and OpenGL graphics - Apple Support
I don't know of any Mac in the last ~decade that's not a multicore. AFAIK, Intel Core 2 was the last single-core Intel processor that Apple shipped.
Kinda surprised Corel doesn't have a "yeah, this'll work" app or menu prompt that determines this "can I upgrade?" info for you, but whatever.