Seller included another 8x1 RAM (in package - same model - total 8 x 2 RAM ) which was not working in his system. somehow after couple of testing Both RAM working at my end.
what a great guy ! many thanks @keychain for amazing deal.
package delivered today.
checked RAM in bios. (don't have OS in that system) working perfectly. will test in windows in next 1-2 days.
Leaving positive feedback.
Thanks for the deal @keychain