diff --git a/src/add-ons/accelerants/nvidia/InitAccelerant.c b/src/add-ons/accelerants/nvidia/InitAccelerant.c
index fa05de72d2..fbd398639c 100644
--- a/src/add-ons/accelerants/nvidia/InitAccelerant.c
+++ b/src/add-ons/accelerants/nvidia/InitAccelerant.c
@@ -4,7 +4,7 @@
 
 	Other authors:
 	Mark Watson,
-	Rudolf Cornelissen 10/2002-2/2006.
+	Rudolf Cornelissen 10/2002-3/2006.
 */
 
 #define MODULE_BIT 0x00800000
@@ -42,8 +42,8 @@ static status_t init_common(int the_fd) {
 		si->settings.logmask, si->settings.memory, si->settings.hardcursor, si->settings.usebios, si->settings.switchhead, si->settings.force_pci));
 	LOG(4,("init_common: dumprom %d, unhide_fw %d, pgm_panel %d, dma_acc %d, tv_output %d, vga_on_tv %d\n",
 		si->settings.dumprom, si->settings.unhide_fw, si->settings.pgm_panel, si->settings.dma_acc, si->settings.tv_output, si->settings.vga_on_tv));
-	LOG(4,("init_common: force_sync %d\n",
-		si->settings.force_sync));
+	LOG(4,("init_common: force_sync %d, gpu_clk %dMhz, ram_clk %dMhz\n",
+		si->settings.force_sync, si->settings.gpu_clk, si->settings.ram_clk));
 
  	/*Check for R4.5.0 and if it is running, use work around*/
  	{
diff --git a/src/add-ons/accelerants/nvidia/engine/nv_general.c b/src/add-ons/accelerants/nvidia/engine/nv_general.c
index ac36f2e26e..548b72ad63 100644
--- a/src/add-ons/accelerants/nvidia/engine/nv_general.c
+++ b/src/add-ons/accelerants/nvidia/engine/nv_general.c
@@ -1,7 +1,7 @@
 /* Authors:
    Mark Watson 12/1999,
    Apsed,
-   Rudolf Cornelissen 10/2002-2/2006
+   Rudolf Cornelissen 10/2002-3/2006
 */
 
 #define MODULE_BIT 0x00008000
@@ -91,7 +91,7 @@ status_t nv_general_powerup()
 {
 	status_t status;
 
-	LOG(1,("POWERUP: Haiku nVidia Accelerant 0.73 running.\n"));
+	LOG(1,("POWERUP: Haiku nVidia Accelerant 0.74 running.\n"));
 
 	/* log VBLANK INT usability status */
 	if (si->ps.int_assigned)
@@ -1545,6 +1545,22 @@ static status_t nv_general_bios_to_powergraphics()
 		NV_REG32(NV32_PFB_CLS_PAGE2) &= 0xffff7fff;
 	}
 
+	/* tweak card GPU-core and RAM speeds if requested (hoping we'll survive)... */
+	if (si->settings.gpu_clk)
+	{
+		LOG(2,("INIT: tweaking GPU clock!\n"));
+
+		set_pll(NV32_COREPLL, si->settings.gpu_clk);
+		snooze(1000);
+	}
+	if (si->settings.ram_clk)
+	{
+		LOG(2,("INIT: tweaking cardRAM clock!\n"));
+
+		set_pll(NV32_MEMPLL, si->settings.ram_clk);
+		snooze(1000);
+	}
+
 	/* setup AGP:
 	 * Note:
 	 * This may only be done when no transfers are in progress on the bus, so now
diff --git a/src/add-ons/accelerants/nvidia/engine/nv_info.c b/src/add-ons/accelerants/nvidia/engine/nv_info.c
index 70468500f2..34ef1009a5 100644
--- a/src/add-ons/accelerants/nvidia/engine/nv_info.c
+++ b/src/add-ons/accelerants/nvidia/engine/nv_info.c
@@ -1,7 +1,7 @@
 /* Read initialisation information from card */
 /* some bits are hacks, where PINS is not known */
 /* Author:
-   Rudolf Cornelissen 7/2003-1/2006
+   Rudolf Cornelissen 7/2003-3/2006
 */
 
 #define MODULE_BIT 0x00002000
@@ -2060,6 +2060,26 @@ static status_t translate_ISA_PCI(uint32* reg)
 	return B_OK;
 }
 
+void set_pll(uint32 reg, uint32 req_clk)
+{
+	uint32 data;
+	float calced_clk;
+	uint8 m, n, p;
+	nv_dac_sys_pll_find(req_clk, &calced_clk, &m, &n, &p, 0);
+	/* programming the PLL needs to be done in steps! (confirmed NV28) */
+	data = NV_REG32(reg);
+	NV_REG32(reg) = ((data & 0xffff0000) | (n << 8) | m);
+	data = NV_REG32(reg);
+	NV_REG32(reg) = ((p << 16) | (n << 8) | m);
+
+//fixme?
+	/* program 2nd set N and M scalers if they exist (b31=1 enables them) */
+	/* program 2nd set N and M scalers if they exist (b31=1 enables them) */
+	if (si->ps.ext_pll) DACW(PIXPLLC2, 0x80000401);
+
+	log_pll(reg, req_clk);
+}
+
 /* doing general fail-safe default setup here */
 static status_t	nv_crtc_setup_fifo()
 {
diff --git a/src/add-ons/accelerants/nvidia/engine/nv_proto.h b/src/add-ons/accelerants/nvidia/engine/nv_proto.h
index ae7261a6b8..091ccf0075 100644
--- a/src/add-ons/accelerants/nvidia/engine/nv_proto.h
+++ b/src/add-ons/accelerants/nvidia/engine/nv_proto.h
@@ -37,6 +37,7 @@ status_t i2c_init(void);
 
 /* card info functions */
 status_t parse_pins(void);
+void set_pll(uint32 reg, uint32 clk);
 void get_panel_modes(display_mode *p1, display_mode *p2, bool *pan1, bool *pan2);
 void fake_panel_start(void);
 void set_specs(void);