Correct, it is only rated for 1333MHz. However, DDR3-1333 is the standard memory specification for processors like the i5-7xx and i7-8xx. For DDR3-1600, you need to do some overclocking.
In the end, I don't think you'll notice a difference between DDR3-1333 and DDR3-1600 anyways. There's already plenty of bandwidth readily available in dual channel DDR3-1333.
and help me why would lower V ram 1.5 v vs 1.65 v ram be different casue theres even some with 1.9v im looking at with 7-7-7-20
Yes, lower timings is still better, but the impact on performance is not significant. You'll see the difference in benchmarks, but the real world impact is unnoticeable.
JEDEC is an association that sets standards on these kinds of electronics. They define 1.5V as the standard voltage for DDR3. This standard is set to ensure reliability, stability, and compatibility.
Increasing the voltage is great to push the clockspeed - increasing bandwidth, and lower timings - lower latency. However, this usually comes at the cost of long term reliability and stability.
The best example of this is the infamous DDR2 Ballistix ram that used 2.2V instead of the standard 1.8V. They were probably the best performing ram with great overclocking potential and low timings. However, I've seen many people posting on forums and on newegg about how their stick(s) of Ballistix ram died on them. Many of them also mention having to RMA dead Ballistix ram for the second or third time.
It's fine to get high performance ram that requires higher voltages. However, you're looking for something reliable, so I would recommend sticking with the standard 1.5V ram. If you do decide to buy DDR3-1600 anyways, be sure to find a set that uses 1.5V.
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