diff --git a/tools/intel_gpu_top.c b/tools/intel_gpu_top.c
index 66e61c4c..21fa844f 100644
--- a/tools/intel_gpu_top.c
+++ b/tools/intel_gpu_top.c
@@ -86,6 +86,98 @@ add_instdone_bit(uint32_t bit, char *name)
 	num_top_bits++;
 }
 
+static void
+print_clock(char *name, int clock) {
+	if (clock == -1)
+		printf("%s clock: unknown", name);
+	else
+		printf("%s clock: %d Mhz", name, clock);
+}
+
+static int
+print_clock_info(void)
+{
+	uint16_t gcfgc;
+
+	if (IS_GM45(devid)) {
+		int core_clock = -1;
+
+		pci_device_cfg_read_u16(pci_dev, &gcfgc, I915_GCFGC);
+
+		switch (gcfgc & 0xf) {
+		case 8: core_clock = 266;
+		case 9: core_clock = 320;
+		case 11: core_clock = 400;
+		case 13: core_clock = 533;
+		}
+		print_clock("core", core_clock);
+	} else if (IS_965(devid) && IS_MOBILE(devid)) {
+		int render_clock = -1, sampler_clock = -1;
+
+		pci_device_cfg_read_u16(pci_dev, &gcfgc, I915_GCFGC);
+
+		switch (gcfgc & 0xf) {
+		case 2: render_clock = 250; sampler_clock = 267;
+		case 3: render_clock = 320; sampler_clock = 333;
+		case 4: render_clock = 400; sampler_clock = 444;
+		case 5: render_clock = 500; sampler_clock = 533;
+		}
+
+		print_clock("render", render_clock);
+		printf("  ");
+		print_clock("sampler", sampler_clock);
+	} else if (IS_945(devid) && IS_MOBILE(devid)) {
+		int render_clock = -1, display_clock = -1;
+
+		pci_device_cfg_read_u16(pci_dev, &gcfgc, I915_GCFGC);
+
+		switch (gcfgc & 0x7) {
+		case 0: render_clock = 166;
+		case 1: render_clock = 200;
+		case 3: render_clock = 250;
+		case 5: render_clock = 400;
+		}
+
+		switch (gcfgc & 0x70) {
+		case 0: display_clock = 200;
+		case 4: display_clock = 320;
+		}
+		if (gcfgc & (1 << 7))
+		    display_clock = 133;
+
+		print_clock("render", render_clock);
+		printf("  ");
+		print_clock("display", display_clock);
+	} else if (IS_915(devid) && IS_MOBILE(devid)) {
+		int render_clock = -1, display_clock = -1;
+
+		pci_device_cfg_read_u16(pci_dev, &gcfgc, I915_GCFGC);
+
+		switch (gcfgc & 0x7) {
+		case 0: render_clock = 160;
+		case 1: render_clock = 190;
+		case 4: render_clock = 333;
+		}
+		if (gcfgc & (1 << 13))
+		    render_clock = 133;
+
+		switch (gcfgc & 0x70) {
+		case 0: display_clock = 190;
+		case 4: display_clock = 333;
+		}
+		if (gcfgc & (1 << 7))
+		    display_clock = 133;
+
+		print_clock("render", render_clock);
+		printf("  ");
+		print_clock("display", display_clock);
+	}
+
+
+	printf("\n");
+	return -1;
+}
+
 int main(int argc, char **argv)
 {
 	intel_get_mmio();
@@ -194,6 +286,9 @@ int main(int argc, char **argv)
 		      top_bits_sort);
 
 		printf(clear_screen);
+
+		print_clock_info();
+
 		printf("ring idle: %3d%%  ring space: %d/%d (%d%%)\n",
 		       ring_idle,
 		       total_ring_full / 100, ring_size,