diff --git a/drm/nouveau/nvkm/subdev/fb/ramgf100.c b/drm/nouveau/nvkm/subdev/fb/ramgf100.c
index 093223d..1858dac 100644
--- a/drm/nouveau/nvkm/subdev/fb/ramgf100.c
+++ b/drm/nouveau/nvkm/subdev/fb/ramgf100.c
@@ -569,6 +569,7 @@ gf100_ram_ctor(const struct nvkm_ram_func *func, struct nvkm_fb *fb,
 	enum nvkm_ram_type type = nvkm_fb_bios_memtype(bios);
 	bool uniform = true;
 	int ret, i;
+	u64 lower;
 
 	nvkm_debug(subdev, "100800: %08x\n", nvkm_rd32(device, 0x100800));
 	nvkm_debug(subdev, "parts %08x mask %08x\n", parts, pmask);
@@ -595,6 +596,12 @@ gf100_ram_ctor(const struct nvkm_ram_func *func, struct nvkm_fb *fb,
 
 	nvkm_mm_fini(&ram->vram);
 
+	lower = nvkm_rd32(device, 0x100ce0);
+	printk(KERN_ERR "%08x\n", (u32)lower);
+	lower = ((lower & 0x000003f0) >> 4) << (lower & 0x0000000f);
+	if (lower != size)
+		uniform = false;
+
 	/* if all controllers have the same amount attached, there's no holes */
 	if (uniform) {
 		ret = nvkm_mm_init(&ram->vram, rsvd_head >> NVKM_RAM_MM_SHIFT,
@@ -605,15 +612,15 @@ gf100_ram_ctor(const struct nvkm_ram_func *func, struct nvkm_fb *fb,
 	} else {
 		/* otherwise, address lowest common amount from 0GiB */
 		ret = nvkm_mm_init(&ram->vram, rsvd_head >> NVKM_RAM_MM_SHIFT,
-				   ((bsize * parts) - rsvd_head) >>
+				   (lower - rsvd_head) >>
 				   NVKM_RAM_MM_SHIFT, 1);
 		if (ret)
 			return ret;
 
 		/* and the rest starting from (8GiB + common_size) */
-		ret = nvkm_mm_init(&ram->vram, (0x0200000000ULL + bsize) >>
+		ret = nvkm_mm_init(&ram->vram, (0x1000000000ULL + bsize) >>
 				   NVKM_RAM_MM_SHIFT,
-				   (size - (bsize * parts) - rsvd_tail) >>
+				   (size - lower - rsvd_tail) >>
 				   NVKM_RAM_MM_SHIFT, 1);
 		if (ret)
 			return ret;