Yes, as long as the computer doesn't crash then it should be fine (stable). You can perform testing using Memtest86+. Your system is stable if it has passed the test without errors.
After testing it using Memtest86, if your system can run 24/7 without crashing then it's stable. Normal temperature of RAM doesn't matter. You can touch the memory. If it's not too hot like boiling water, then it should be fine.