depends on the card and air flow of your case. when you run a stress test your forcing the card to 100 percent load and 100 percent power. depending on the heat sink and fan of the vendor and how the gpu are binned some cards have better cooling then other. one thing on all gpu is is the fan and bios working right on the gpu. vendors if they use the standard nvidia firmware the fans run at 20-40 percent of max speed to keep the noise down. when the card gpu hit a heat set point the fan should be ramping up to it max speed. at 50c or hotter you should be able to hear the gpu fan. i would download open hardware monitor and msi afterburner. in open hardware monitor look at the gpu temp and fan speed. then go into msi afterburner and set the fan speed to max. you should hear the fan spin up. it should show that it max out in hardware monitor. if it not spinging up then i would do an rma for safety of your system. if the gpu fan does spin up put the gpu back under load and see if the temp get as hot as they did. if they start geting near the same rang try taking off the side panel of your pc case and see if the temps drop. if the temps do drop a lot then there an airflow issue. may want to see if you can put a fan on the side panel that would pull air in.