The initial thermal performance as measured by the 100W synthetic temperature test on the small copper interface die places the CoolJag JVC258A about dead center on this list of reference heatsinks. Let's jump right to the final rise above ambient temperatures to see where things actually stand.

Rise Above Ambient Temp. (c)
Mfg.	Model	27mm large copper block	15mm small copper block		27mm large copper block	15mm small copper block
		50W	50W		100W	100W
Thermalright	SLK800	13.1	15.8		23.5	29.9
Thermalright	AX-7	13.1	15.4		24.4	30.4
Coolink	U1P2	13.3	19.8		26.8	36.1
Tocools	Novasonic	18.0	17.0		31.5	36.5
Thermal Integration	TI-V77L	12.6	17.9		31.0	37.1
Arkua	628	18.8	18.2		35.0	38.4
Coolermaster	HSCV83 (high)	14.8	20.7		29.5	41.0
Sibak	AC02625B	18.1	35.8		20.0	41.5
Sibak	AC06725TH	20.4	23.7		39.2	45.2
Vantec	CCK-6027D	18.0	22.2		37.5	46.0
Coolermaster	HHC-001	18.3	23.1		34.3	46.4
Dynatron	DY1206BH-625	16.8	31.9		24.4	47.2
AVC	Tundra2	19.4	26.5		37.0	49.1
NengTyi	XPC5000	22.6	25.2		45.2	52.2
Titan	TTC-CU5TB	22.0	27.0		37.6	52.2
Akasa	Ag mountain2Q	20.7	26.8		39.5	52.8
Coolermaster	HSC-V62	26.0	31.4		40.3	53.1
CoolJag	JVC258A	21.0	26.2		39.1	53.2
Zalman	CNPS6000-Cu	21.6	29.0		40.8	53.4
Spire	5F263	22.1	29.2		41.7	53.6
Taisol	CGK760092	19.3	37.8		27.9	54.1
Eumax	EU01	20.9	27.6		38.2	54.5
AVC	112AM1	21.8	28.1		45.3	54.8
Spire	5T235	20.7	28.0		40.5	55.8
Taisol	CMK702	20.2	28.1		41.0	57.8
Thermaltake	Volcano 6cu+	13.8	28.8		32.1	57.9
Evercool	ND19715CA	21.9	31.5		44.3	60.4
Coolermaster	HHC-L61	25.7	26.8		49.7	60.8
Spire	5U213C1H3G	26.0	34.6		47.3	63.5
Akasa	AK821	26.7	34.5		51.4	70.5
Verax	P11T	35.1	43.6		64.8	76.6
Verax	P14	30.8	41.3		55.5	75.1
		50W	50W		100W	100W

Thermal performance of the CoolJag JVC258A is just short of the 50 degree Celsius mark, but still relatively close. The JVC258A being a largely aluminum based heatsink exhibits pretty good cooling capability and would be a fine choice for most systems, though there are better options available if overclocking is your game.

While CoolJag do not explain much of the reason behind their V-Type Skiving technology, we can easily assume a few points if we consider similar technologies already in use.

First off we have the triangular shaped base to consider. This feature is different from most heatsinks which have a flat base at the bottom of the fins. This area of the base of the heatsink also happens to be at the center of the heatsink which typically receives the least amount of airflow from the fan. This is generally known as the 'dead spot' since the fan's motor is located directly above causing air in this space to stall. By angling the base upward in this region, I'd guess that the effect of the standing air will be lessened.

The nifty 'V-Type' angled skived fins put more fin-material directly into the flow of air from the fan which has the highest velocity. The angeled aspect also allows the base to remain relatively compact so it doesn't interfere with adjacent capacitors. All these aspects are assembled into one heatsink known as the CoolJag JVC258A, which while exhibiting good performance, really makes me want to test out a full-copper version!

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