The bigger Noctua NH-L12S is the successor to the NH-L12 and measures just 128x146mm (WxD) with 70mm height both with and without a fan, due to the fact that it has a specific design where the fan is attached below the heatsink. The NH-L12S weighs 390g (420g with fan) and supports most modern CPUs with TDP of up to 95W, which include Intel socket LGA2066, LGA2011-0 & LGA2011-3 (Square ILM), LGA1156, LGA1155, LGA1151, LGA1150 and AMD AM2, AM2+, AM3, AM3+, AM4, FM1, FM2, FM2+ (backplate required) sockets.
The NH-L12S has four copper heatpipes and copper base with soldered joints and nickel plating, attached to an aluminum heatsink. It also comes with Noctua's 120mm NF-A12x15 PWM fan spinning between 450 and 1850 RPM (1400 RPM with Low-Noise Adaptor (L.N.A.)), producing a maximum airflow of 94.2 m3/h at 23.9 dBA of noise.
The smaller Noctua NH-L9a-AM4 aims at even tighter spaces with dimensions set at 114x92mm (WxD) and a height of just 37mm with the fan. It weighs 390g (465g with fan). Despite its smaller size, it still supports up to 95W TDP CPUs but it is limited to AMD AM4 socket CPUs. Bear in mind that there is a version which supports Intel's sockets.
The NH-L9a-AM4 also uses a copper base with two copper heatpipes with soldered joints and nickel plating which are attached to an aluminum heatsink. The NH-L9a-AM4 uses NF-A9x14 PWM 92mm fan, spinning between 600 and 2500RPM (1800RPM with L.N.A.) and producing 57.5 m3/h of maximum airflow with 23.6 dBA of noise.
Both the NH-L12S and the NH-L9a-AM4 ship with SecuFirm 2 mounting kit, Low-Noise Adaptor (L.N.A.) and NT-H1 high-grade thermal compound. Both are also backed by a six year warranty and should be available shortly with a suggested retail price set at €49.90/US $49.90 for the NH-L12S and €39.90/US $39.90 for the NH-L9a-AM4.