Lag Spikes, Slutters And Low Usage Issue From New Graphics Card While Gaming! Please Help!

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1 - the 300W PSU will still be providing some power to the GPU via the PCIe slot.

2 - IT DOES NOT MATTER if you are using the Antec to only connect the to the GPU's 8-pin connector. The 6-pin connector and wiring from the Antec IS NOT DESIGNED to carry twice as much as its rated load to the GPU.

The 6 pin cable is specified to provide only up to 75W power. The 8-pin connector on GPU expects to be able to pull as much as 150W from that connector.

Your test is therefore not valid nor useful for diagnosing this.