8 speed/9 speed info needed!

Just need some help! am still using a 8 speed setup, deore chainset (m590)
with 8 speed through out
my front mech is getting a bit worn out, its a Altus , fancy a deore or slx front mech, would there be much rub with the 8 speed chain?
running 3 rings at the front, have read here and there, some people run 9 speed chains on a 8 speed setup? silly or ?
with 8 speed through out
my front mech is getting a bit worn out, its a Altus , fancy a deore or slx front mech, would there be much rub with the 8 speed chain?
running 3 rings at the front, have read here and there, some people run 9 speed chains on a 8 speed setup? silly or ?
Giant Trance X0 (08) Reverb, Hope Hoops 5.1D, XT brakes, RQ BC, Works Components headset 1.5
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there is no benefit in running a 9spd chain on an 8 set up
Parktools :?:SheldonBrown