It all depends on the load and the temperatures. With a 1/8hp compressor you can hold 350w but the evap might be at 15 Celsius. You can size the capillary tubing on a 1/3hp compressor to hold 300w also, but the problem occurs at idle where it may drop to what.. 50w? Without either maintaining a constant load, having a suctionline heat exchanger and accumulator, or a TXV you'll have massive floodback as the compressor will more or less pump a specific amount of refrigerant. This is a huge problem I ran into and which caused me to stop building single-stages, meeting CPU demands while building within case constraints, and achieving temperatures desired. I've only used a TXV on a chiller that always had a constant load and never suffered from floodback but I imagine it would be a way to reduce the issues caused by high-capacity low-displacement builds.