So, while my "adventure" has been temporarily sidelined with a layover in "RMA Purgatory", I decided to try and learn a little more about the much maligned "XD5" pump/res combo from Corsair. I've seen the included pump described as "gimped", "knockoff", etc. here and elsewhere, and I certainly don't make any claims to the contrary, but I'm confused as to how the pump actually differs from others on the market.
I do have some firsthand measurements of the unit's performance. My loop consists of 480x40 radiator, 360x64 radiator, 360x20 radiator, CPU block, GPU block, flow meter, the XD5 itself, and a stupid number of 90-degree/45-degree fittings used mainly because of my aesthetic preferences. Under these constraints, the pump produces a measured (Koolance INS-FM19) flow of roughly 3100mL/min (0.82gal/min or 186L/hr). While we are a long way from the 1.5gal/min league, I would think my loop is of the "high restriction" variety, and the flow seems to reflect that. The tach signal for the pump indicates it is turning 4800 RPM +/- at 100% PWM as expected.
I purchased the unit prior to joining this forum, and I would likely have gone a different route had I been aware of the unit's less than stellar reputation in the community. However, this review led me to believe the unit was viable:
CORSAIR Hydro X Series XD5 Pump/Reservoir Combo Review
WWW.TECHPOWERUP.COM
We add to our detailed coverage of CORSAIR's Hydro X series of custom watercooling products with their XD5 pump/reservoir combo unit. It uses the ever-reliable Xylem D5 PWM pump paired to a...
My question is this, specifically, how is the included pump "gimped" in comparison to its competition. The linked review makes note of the fact that Corsair's published specs reflect an expected flow rate for a "typical" system pressure rather than the theoretical maximums. Is this the source of the unit's bad reputation? The published electrical specifications indicate it will peak at about 30W output. This seems in-line with the rest of the D5 herd. Did Corsair change the model of included pump subsequent to the publication of the linked review? Inquiring minds want to know , and like Bartles & Jaymes, we thank you for your support.
P.S. While typing this up, I recalled reading Avacado's and ciarlatano's comments in the Post your Last Purchase - Page 38 - Chit Chat General - ExtremeHW thread. After rereading them, it seems my question(s) have largely already been answered there. ciarlatano indicates that the pump isn't truly "gimped" but rather that it is a slightly less powerful pump (30W vs 35-37ish maybe?) that Corsair is blatantly overcharging for. This certainly coincides with my experience so far. The pump is "adequate" in a general sense without being a cost-effective option compared to its competition. Hearing the XD5 described as "half flow" so many times prompted me to investigate a little deeper to see how accurate the statement is. I now regard it as just a general "knock" against Corsair's current business practices rather than a statement intended to be taken as measurable fact. The pump isn't "half flow", it's just overpriced for what it is.
P.P.S. I debated deleting this entire post after coming to the conclusion indicated in the paragraph above, but I think I will post it anyway on the off chance that another noob like me might benefit from it. Especially the sort of noob that replies to every answer from an expert with the follow up question, "but, why?".