Hello Moshin,
You can check SAP certified hardwares from the link;
Certified SAP HANA® Hardware Directory
If the hardware is in the list performance will be okey in my opinion. SAP certifies the hardware so there mustn't be any other authority. You can check the appliance according to the specifications given in above link.
You can also use "SAP HANA Hardware Configuration Check Tool" to check your hardware. This tool is used especially for TDI hardware.
Regards,
Yuksel AKCINAR