CPU getting very hot

So I am now successfully running a MC server

My specs are:
Fractal Design Arc Mini Black High Performance PC Computer Case w/ USB 3.0 and 3 Fractal Design Silent Fans - Newegg.com

ASUS Model DRW-24B1ST/BLK/B/AS 24X DVD Burner - Bulk Black - Newegg.com

Seagate Barracuda ST500DM002 500GB 7200 RPM 16MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive - Newegg.com

ASUS F2A55-M LK PLUS FM2 AMD A55 (Hudson D2) Micro ATX AMD Motherboard with UEFI BIOS - Newegg.com

SeaSonic S12II 620 Bronze 620W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply - Newegg.com

G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBRL - Newegg.com

Newegg.com - AMD Athlon X4 750K Trinity 3.4GHz Socket FM2 100W Quad-Core Desktop Processor - Black Edition AD750KWOHJBOX

ASUS HD7770-DC-1GD5-V2 Radeon HD 7770 GHz Edition 1GB 128-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card - Newegg.com

Everything is going smoothly, and the 4-6 others on my server (all using very low-powered machienes) are saying they are getting about 40fps.

The problem is that my CPU is reaching 90 degrees celcius

Is this a huge problem, or is it just "far from optimal"

I want to host the server (which works well now thanks to people on TSF), but if my CPU will degrade over time as a result of hosting this server for a few hours each week, I will not do it.

What should i do?